I do a few surveys on MTurk from time to time. I look for the ones from educational facilities or students who are conducting research for their thesis or some study. Some pay well. I got a $4 one the other day that took about 15 minutes to complete, then I've had $1 that said they were 10 minutes and took much longer. I just do these for extra cash, not even as part of my regular income, and I make about $50-100 a month at night while I'm watching t.v.