Google forms. Don't even need a cash incentive. People love giving their opinions. In fact, the cash incentive is a bit of a turn off. I happily waste hours a

Google forms. Don't even need a cash incentive. People love giving their opinions. In fact, the cash incentive is a bit of a turn off. I happily waste hours a day giving my opinion on the internet, but now that you've paid $20, it becomes work.