I'm thinking of doing this. I know the product has to be something of very good quality. Maybe not directly but through a banner on the site I'll be promoting through PPC. The reason I'm thinking of doing this is because you'll make money instantly (if you do make any money). You won't have to wait weeks or months to be paid by your advetiser. You can then use the money again on campaigns. Has anyone ever tried doing this? Maybe he or she can give me some suggestions/tips?