i have some doubts<p>in it's simplest form an add network has 4 participants<p>* advertiser (the one who pays the bills, and wants to sell stuff to customer)<p>* add network (provides the infrastructure and the network of publishers, has bills to pay)<p>* publishers (which sell their screen real estate and want money from the add network in return)<p>* user (pot. customer, must click on the adds, valuable for the advertiser only if he buys something from him)<p>the thing is, the user is only valuable to the advertiser if he becomes a customer - if the user clicks just because he "wants to do some good" he is not as valuable as user who clicks because of "honest interrest" on the add.<p>so basically this systems needs to find publishers which want less money from their screen real estate because the advertisers will definitiv not be willing to pay as high prices for that "goody two shoes" traffic than they would for other "better qualified" traffic.<p>one more thing: i once worked with a startup which wanted to do the same thing with banner (and in-email) adds - and lets just say: i will never work in the charity vertical ever again.