Why not create a real Web site with original content and advertise that? Who knows--you might find that "preselling" prospects with intrinsically useful information would lead to better affiliate conversions and ROI.
I agree with signor_john- if you feel you must use AdWords to generate traffic, at least build your own unique content. The other advantage with that is that you are more likely to get an increase in organic traffic and links, and free traffic almost always improves your ROI better than paid traffic. :)
[edited by: LifeinAsia at 5:26 pm (utc) on Dec. 29, 2008]