Don't do the upsell thing, Google will perceive it as cloaking and will kill your account very quickly. Contacting site owners is a good idea though, it's a si

Don't do the upsell thing, Google will perceive it as cloaking and will kill your account very quickly. Contacting site owners is a good idea though, it's a simplified version of media buys. You don't need to pay CPM or use an adserver, just whip up a simple PHP/javascript code to rotate banners and track clicks and offer to pay them monthly to split test your code with their existing banners.