If you do I would suggest you be very careful about the affiliates you accept and regularly monitor traffic to be sure you are not getting fraud traffic
A friend of mine runs his program through Clixgalore. He offer 10% commission, not PPC, but says they were one of the easiest to set up and required a low financial committment from him to get started.
I don't know the subject of your site but if it is selling something why not offer commission, that way you won't get fraud traffic, or if you do at least it won't cost you anything more than bandwidth.
My site is an affiliate site with coupons. I want to get more subscribers to my newsletter and just more traffic to my site. Maybe I can create a per lead program for my newsletter.