One of the main reasons places like Clickrewards, All advantage, and so many of the others are no longer in the shape they use to be (assuming they even exist anymore) is because of the huge number of people who cheat them for a few miles. Clickrewards sells survey participants to Opnion place, not one person taking the survey 20 times. Same with the others, the number of people either wasn't there or couldn't be justified anymore because everybody is cheating the system.
I personally have loved some of these systems that have come and gone but it's easy to understand when somebody wants to take 10 surveys and posts it in a forum how easy it is to cheat Opnion Place. It's no wonder the sponsors of such programs are having second thoughts.