It's been tried. What that usually means is you manage the ads yourself, or it's some really small ad network which doesn't have that many advertisers on it com

It's been tried. What that usually means is you manage the ads yourself, or it's some really small ad network which doesn't have that many advertisers on it competing to give money to the website. Advertisers are as lazy as anyone else, they don't want to have to deal with numerous agencies to deploy ads, they want one, maybe two, and would certainly like it a lot if they had some metrics to show their boss.