Amazon Giving Away Gift Certificates for Survey Participants

I've been shopping on amazon.com for a long time. Recently, I came across amazon's announcement that they would give out gift certificates for participants doing a usability study/survey on their website. If you're interested in doing the study, go to this link on amazon's website. Or, if you don't hear from them after a few days, you can email them at usabilitygroup@amazon.com. If you're selected and if you complete the survey, Amazon will award you a $50 or $100 gift certificate. I hope that I'm selected because the gift certificate would help me earn back part of the hundreds of dollars that I spent on ordering books and best-selling novels from Amazon.