Well for one lets just say most people that I know, adults wont register for this. Most will think it's a scam, others will think its a waste. They wont join. The only ones who will most likely join are kids, teens. I don't know many.
If you answer truthfully your not going to get approved for most of the surveys, but if you lie you risk the survey not getting approved.
The good things are 60.000+ points. But you earn about 20 -100 points per survey or other offer. yet by the time we have taken the time to get 60.000 points we would have payed for two of the items(Such as an Xbox360) in our goals. Yes they get payed for the surveys we take. we get not even a fraction of the amount.
Unless you get your parents to agree to give their card info out(Or want to use your own debit/credit card) you wont make any real points on this site at all. The 500 - 1000 offers I've seen requires you to use a credit card and don't have a high approval rating.
Well I'm still waiting for my item to be shipped so i can play more(I ordered it yesterday, it wont ship till tomorrow). But these games have people who sit there all day and take money form less experienced members.
These are just my opinions. If you disagree feel free to post and we can discuss..