Besides CPC (cost per click), more affiliates start to dabble in CPV (cost per view) to drive more traffic to CPA offers. CPV marketing is extremely powerful and targeted.
CPV is highly targeted because you can pop up whatever you want to promote on targeted web sites and keywords.
So CPV looks like a viable medium to test and is a lot cheaper than Cost Per Action (CPA) or the highly debated banner impressions model.
Banner impressions is usually sold by number of impressions, which means every time your banner is displayed regardless of the action of the website visitor. But with CPV your ad is only displayed depending on the keywords used.