I'm sure there are people who have been paid, any scamming company that wants to stay in business will pay a few people all of the time so they have staunch supporters to stand up to the crowds of people holding up the scam signs and call them cheaters. Anybody remember NetWinner? How about CrewBux? They both did the same thing until their crappy business models sunk their respective ships. Good riddance to both. Unfortunately, Bidvertiser will probably be around a lot longer than both of them put together.
If you think you can beat them at their own game or perhaps be one of the few who get paid all the time, go for it. But if you get scammed at the last, don't say I didn't warn you.