Nah, it's sound good but the truth aren't. Actually you only can earn by inviting friends (referral link) not for simply learning or answering questions. I know you give $5 for the top 10 daily visit and completing quiz, but you need to put lot of times and effort to get selected. Yeah, I'm not wrong if I say this is a faucet (micro-earning).

Even I have 500-1000 friends, probably only 5-10% will registered under my referral links.