I believe the commission is just 2 percent and not 7 percent. It's been a while since I've been out of the affiliate game but I believe if you can join their program through commission junction as well.
There are multiple survey software platforms. There maybe one that is better than another based on your specific needs. See below link to review the Top 10 survey software. http://www.capterra.com/sem/survey-software?headline=Top%2010%20Surveying%20Software&gclid=CLXsmM6SoM4CFQoJaQodgGUOFA