I joined this site to get the sign-up bonus points from Hilton HHonors rewards program. I wasn't sure I would stay because it seemed like you had to make purchases to earn points. I was pleased to see that you can also earn points through reading emails (and clicking the link that verifies you have read the email). They also offer free points for joining sites like viewpoints.com. They ended up having a much better mix of point earning options than I expected in the beginning.
