Whenever you get an e-reward e-mail, the key is to always say that you are highly interested in whatever is being pushed on you, regardless of what it is.

I just got a $50 e-reward today in my e-mail!!! I had to answer about 20 questions regarding a technical subject I knew nothing about. It was a follow-up from another survey where I told a little white lie and said that I was responsible for purchasing computer equipment for a large corporation.