Taking Paid Surveys is not all that difficult to work out for yourselves how all the technicalities work, but being told by someone else sure does make it easier. It's not easy to explain it all very quickly but I'll do my best. If you like to learn by looking rather then reading, then the diagram below explains it quite nicely.

How Does the Survey System Work?
Well, a big company will send an online survey to a GPT site and request that 10,000 people take it before the results are sent back to it. With the survey, the company will also send $12,000. The GPT site will then take $2000 for itself, then ask 10,000 people to complete the survey promising $1 if they finish it. Then when 10,000 people have taken it, they'll send the results back to the company to evaluate. This is just an example of what might happen.

What Does the Company Get Out of It?
Companies are constantly trying to improve their products so they feel that if their products are improved enough, then more people will want to buy it. They then hope they'll make that $12,000 back on better sales as their products have been improved by us telling them what we think.

What Does the GPT Site Get Out of It?
It will keep a certain amount of the money for themselves. The best survey sites make the least money themselves as they are giving more of it to their users.

What Does the User Get Out of It?
Duh, Free Money for Ticking a Few Boxes!