Q. So there is a chance I may not receive a free USB drive.
A. It is possible, however we are trying to get as many advertisers as possible in the US, Canada, Australia, New Zealand, and the UK. We only get paid if we bring in advertisers. The more advertisers we get the more we get paid and the better the chances of your receiving a free USB drive.
http://www.usbforfree.com/faqs.html

I say bullshit