I came across Rewarder.com because of someone else who notified me. I started answering questions - won a couple rewards. However, I have answered over 400 questions and won less than $50. IT is a hassle to collect. They are unresponsive - they won't answer emails. Rewards are not paid by any reasonable method - I have lost rewards that were awarded to responders whose answers were incorrect. They may use your expertise but it won't be worth your time. I've checked a few and noted that they seem to pay some "experts" at the beginning - then forget about them. An expert is anyone who answers a question - whether or not he has any clue what he is talking about.
The $45 was nice, but considering the time I put in I figure I made about $5 an hour - my time is worth more than that to me.