You have to invite a minimum of 5 users before you can withdraw your funds. It means 5 ridiculously hard surveys to get through. And sometimes these surveys aren't really surveys but dodgy sites trying to collect your credit card information as well as your personal information which they will use to spam you with unsolicited calls. I tried these surveys before and most of the time, I didn't even get credited when I completed them.
Don't do it. They're probably not going to pay you either.
Either they're getting paid more than $10 per survey you do, which is unlikely, or they're not going to pay you. That simple. There are no positive reviews anywhere on the net.