@Wipe44: As we are a US based company, we are required by law to have this form on file for every publisher we pay, regardless of what country they live in. It's nothing more than just stating whether you are to be taxed or not by the US.
@Mr-R-T & @damnyou: We pay on a per action basis, which varies for each offer; it could be something as simple as submitting your email address. When I say views, this is taken into account - while you will not technically be getting paid for every view, if you were to calculate your eCPM (earnings / impressions * 1000), you would see an eCPM of $50, $100, or even more (with some tweaking and know how).