There is a while industry of Pay Per View (PPV) ad networks that basically operate this way. A few that come to mind: Trafficvance, LeadImpact, Media Traffic an

There is a while industry of Pay Per View (PPV) ad networks that basically operate this way. A few that come to mind: Trafficvance, LeadImpact, Media Traffic and DirectCPV. I don't know where Trafficvance gets their traffic but it seems to be pop-over ads probably from some installed software. DirectCPV seems to be interstitial ads that the sites actually choose to use (think big news sites with an ad before you read the article). Most of them seem to be spyware/crapware driven. Those are the only two I've worked with in the past so I can't speak on the others.