MarketAgent is an official company with the location in Austria, Germany, Slovenia and Switzerland. That alone does not make them trustful. It shows only in which market they are active and which law they have to respect and where they are responsible in front of the law court.

If you are taking a look at their locations then you'll see that the English speaking market is not really their market. Austria, Germany and their location in Switzerland is German speaking. So it does not really make any sense to promote their services if you read their conditions at their website:

Registration as a survey participant: 150 Points

In principle, the invitation to participate in surveys is done by random selection. Which means, that our system uses randomly our address pool and selects the number of participants automatically - this is methodologically necessary. Often, participants must also meet certain characteristics (e.g.: male and living in Berlin or Vienna). Because of this, there can be greater distances between the surveys from time to time and then it can go back quite quickly.

Friend invited by the survey participant : 100 Points
You will receive the points for recommending new member only, when the referred person has completed his/her first survey.

Updating your personal information (1x per year): 50 Points
Please note that the points for updating your personal information will only be credited, if we have asked you to do so via email.

Participation in the online survey: 20 - 250 points

Conversion: 1.2 dollar = 120 cents = 100 bonus points

Bonus points will be awarded to your account immediately after completing each survey. Anytime you can convert Exchange Area the survey points into cash or rather products or services of our cooperation partners. Each time after you collect 200 number of points you can exchange them.

Bank transfer, Paypal, Skrill

From the above statements is ony "Conversion: 1.2 dollar = 120 cents = 100 bonus points" against the European Consumer law, because the U.S. members are getting a better conversation as the European members - actually is € 1.00 ~ US$ 1.09829.

In any case are their conditions only for their own benefit. If you invite someone to their system, then you'll get only paid if he is usefull for them. As you don't know it in front which kind of people they are searching is it nothing else than mass collection of data.

The result of this system can get seen in the comments from Web Of Trust. There has written Rayven_redeye on 04/21/2011 (translated to English):

A little extra income, as I said, you can do so about 30 € per year, to be made depending on the amount of surveys.
You get the surveys sent by mail, if you do not want to participate in the survey, the mail can get ignored because there is no "minimum" that must be met. The transfer works without problems, however, can take up to 3 weeks.

The user azereus has written on 03/28/2011 at WOT (translated to English):

you get around 1x survey per month sent. if make the survey until the end you get up to 2.5 €. adds up to € 30 / year. the money can be transferred on their own account.
Yes it works !!

The user ZLazarow has commented on 04/16/2012 at WOT:

I have completed few surveys and get 600 points(6€), at ask to payout to my paypal acount, onthe web page shows transfer succesful, but money I never get to my Paypal account, I wrote many times to marketagent.com, but not answered to any my mail sent...

I thik this is SCAM

Summary: If we take a look at the above comments then we see that they have not enough surveys that their members can get a higher income. I received never an invitation for a survey from them. It did not make any difference if I have been living in Vienna or at country side near to Vienna and I have been every time a typical consumer (living in a family with kids).

The European consumer data protection law keeps you save that your data are not getting traded.

Only people, which are not able to read and think, will promote marketagent.com at the English speaking part of the world. In any case such people are only wasting their time because they have even not enough surveys for their German speaking members and the referrer gets only paid if the refferal participates on his first survey.

This case shows even that all these other survey sites, which are offering you a high monthly income are only SCAM and they willnot pay you. The worst ones are these, which are asking for a membership fee from you.

The domain registration data from marketagent.com: 

Domain Name: marketagent.com
Registry Domain ID: 3176618_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.rrpproxy.net
Registrar URL: http://www.domainname.at
Updated Date: 2015-02-27T07:15:49.0Z
Creation Date: 1999-01-23T05:00:00.0Z
Registrar Registration Expiration Date: 2016-01-23T05:00:00.0Z
Registrar: Key-Systems GmbH
Registrar IANA ID: 269
Registrar Abuse Contact Email: abuse@key-systems.net
Registrar Abuse Contact Phone: +49.68949396850
Domain Status: ok http://www.icann.org/epp#ok
Registry Registrant ID:
Registrant Name:
Registrant Organization: Marketagent.com Online Research GmbH
Registrant Street: Muehlgasse 59
Registrant City: Baden
Registrant State/Province:
Registrant Postal Code: 2500
Registrant Country: AT
Registrant Phone: +43.2252909009
Registrant Phone Ext:
Registrant Fax: +43.225290900999
Registrant Fax Ext:
Registrant Email: t.schwabl@marketagent.com
Registry Admin ID:
Admin Name: Thomas Schwabl
Admin Organization: Marketagent.com Online Research GmbH
Admin Street: Muehlgasse 59
Admin City: Baden
Admin State/Province:
Admin Postal Code: 2500
Admin Country: AT
Admin Phone: +43.2522909009
Admin Phone Ext:
Admin Fax:
Admin Fax Ext:
Admin Email: t.schwabl@marketagent.com
Registry Tech ID:
Tech Name: Florian Folkmann
Tech Organization: Marketagent.com Online Research GmbH
Tech Street: Muehlgasse 59
Tech City: Baden
Tech Postal Code: 2500
Tech State/Province:
Tech Country: AT
Tech Phone: +43.225290900950
Tech Phone Ext:
Tech Fax:
Tech Fax Ext:
Tech Email: f.folkmann@marketagent.com
Name Server: ns1.sil.at
Name Server: ns2.sil.at
DNSSEC: unsigned
URL of the ICANN WHOIS Data Problem Reporting System: http://wdprs.internic.net/
>>> Last update of WHOIS database: 2015-08-02T09:26:23.0Z <<<

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Individuals are urged to select everybody they know not their system. The attitude is something along the lines of: MLM is "something that anybody can do". On the off chance that you put stock in the framework, then is there any good reason why you wouldn't welcome everybody you know not a piece of it? The more individuals you sign up, the more you can procure from their movement. You can possibly profit from all the business produced from the individuals you enroll, as well as the individuals that they enlist.

Hypothetically, to construct a system, you should do nothing more than sign 5 individuals (first layer down line), on the off chance that they every sign 5 individuals (25 second layer down line), you have a system of 30 underneath you. In the event that your second line every sign 5 individuals (125 third layers down line), your own system has 150 individuals. When you've got 5 layers in your down line, you'll have a system of 3,905 individuals. Presently suppose you each enlisted 7 individuals rather than 5, then you'd have a system of 19,607! Be that as it may, why stop at 7? There is no restriction to what number of individuals you can enroll! So go out and sign the greatest number of individuals as you can. Sounds really straightforward - isn't it?

If you think so then think about why are getting Multi-Level Marketing Systems wasteful promoted? Let us take a look at the standard recruitment procedure of Multi-Level Marketing Systems:

1. The first step is a delicate welcome.
   Somebody you know (or host just met at a get-together), welcomes you to “find out around an energizing new open door”. This is typically joined by some sweet talk along the lines of “I am just letting you know on the grounds that I think you'd be stunning at it” and “I just present individuals in the event that I see they can possibly succeed”. These welcomes are normally extremely dubious. On the off chance that you pose any questions, the answer is generally “tag along to the meeting and every one of your inquiries will be replied”.
   
   
2. The second step is the presentation.
   The meeting you are welcome is a presentation of how that specific multi-level promoting organization lives up to expectations. This is normally not keep running by the individual who enlisted you. Right now you meet somebody in the “up line” who is situated as senior individual from the framework and in this manner a power on the subject. These presentations are frequently done in a gathering or even workshop a domain.
   
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Did you get the value which you have for a Multi-Level Marketing system? Don't worry it is not the value of your personality; it is the value of your money and/or the value of your work-force in which they are interested. Don’t forget that you are only getting paid if you sell something and/or recruit new members. Some systems are even so clever built that your percentage are getting computed by using your sales and recruiting data together with the data from your downline. That is done for maximizing the earnings of the MLM company.