Welcome to the world of E-Rewards, THE MOST RESTRICTIVE survey site out there.
Actually, I don't find it that bad compared to some of the really dreadful companies. If you focus on Blockbuster and Hilton, you can easily get your 6 rentals + many thousands of points annually. Just realize that the other awards are merely coupons that you can find for free elsewhere.
E-poll is MUCH worse. After spending far too much time on their polls, I think I cashed it in for a $5 gift certificate and quit.
But the absolute WORST ones of all are the pathetic "survey companies" (I can't even say it with a straight face) that don't even pay you anything - they put you in a "drawing" for a "cash award" that is paid out "every so often". Give me a f***ing break - are people really that stupid?