Has anyone gone to the trouble of doing tests to find out if removing PPC ads on your website to see if it would improve conversions. If you did, was the loss of PPC revenue made up for with an increase in affiliate sales?
I have done the the reverse, i.e. adding affiliate ads and saw no noticable effects to my Adsense . Seriously, I havent done much research on your question but I feel that it would depend on the site alot and the CTR of your PPC (I presume you are referring to stuff like Adsense YPN) rather than buying traffic through PPC. Say a site had 10% CTR .. I would assume you would lose around 5% click through of your Affiliate stuff due to losing some eyeballs that click out of your site without reviewing your page.