Give Getty Feedback, Get Gift Certificates
From the Getty blog: "We’ll get in touch when we’re running research with people who match your profile.
What about the money? Participants we schedule can expect a generous gift certificate in return for their time."
According to Getty, after filling out the form you get added to their customer research database. If your profile matches who they want to speak to for their current usability study, you'll get a call. Each usability study consists of around 12-20 people and each gets a gift certificate for participating.