I was working a lot in the summer & fall of last year, and then stopped for a few months when things got bad. I recently started doing it again. (I'm a specialist)
My experience is I'm usually b2b, or pretty dang close to it, even during the weekdays. Last month I worked about 3 weeks and I made $250. I did invest quite a few hours on some of those days, though. The categories you pick are very important. Some pay much higher than others (but typically are "harder" problems). If you are familiar with Disney World, or other travel/tourist-y type areas, definitely put those in. I think they pay $.18 each. I ditched the "Who is..." queries b/c I hated them with a passion. They always took a long time and they were only paying $.10.
They have a new rating scale for specialist/generalist where they pick a few of your answers each day and rate them. At the end of the week you get your quality & completion rates. I don't see what difference it makes since it doesn't effect your pay rate.
Maybe if you get way too many low quality weeks you'll get fired. Not sure. I've been 95+ for 5 weeks now.
Overall, I preferred ChaCha much more before the bruhaha last year. I sometimes feel like working for $3/hr is ridiculous. Anyone that tells you they are making $10/hr has to be lying.
So IMO ChaCha would be worth it for you if you had nothing else to do and just wanted to make a little extra play money. No way would I ever recommend trying to do it to pay bills or a mortgage. It's too risky and unpredictable.
As long as they are happy with the answer (used good punctuation, no blacklisted sites, etc), I'm sure you'll pass. 
oh well - hopefully that won't hurt me too much. I'm really excited to give ChaCha a try.
