Check the sig. I do a good bit of it, but my girlfriend makes close to $100 a month now. It IS NOT a get rich quick scheme because you don't get rich, and it is certainly not quick. Sure, someone people do make a fair amount, but they also spend a lot of time, effort, and sometimes money to get that extra bit (you might have to pay say $5 for a sample a get $25 back, or give your credit card number).
It IS JUST a supplemental source. That being said, anyone doing these sites should leave it in their signature as advertising is against the rules, however, as long there are no links here, I see no reason to close.
Feel free to ask any questions.