For the first few months I was "abusing" eRewards by blindly clicking answers (though I did at least make sure to keep an eye out for the quality control questions). After 2-3 months of this (when I was getting 1-3 surveys/day), my account all of a sudden stopped for about 2-3 weeks. I came here to find out why and some people mentioned that this sort of abuse may cause them to stop sending surveys. I eventually got another survey, and actually took the time to answer the questions truthfully. Since then I've slowly been getting more and more to the point where now I get 2-3/week.

But now I have a eMiles account where I'm 20 pts shy of a redemption and haven't gotten any new offers in 2-3 weeks!