moTi - 11:59 am on Feb 1, 2013 (gmt 0)
You are misunderstanding what DoubleClick for Publishers is.
well, i wasn't precise enough. let alone the house ads that you put into the system yourself, what else would ad networks be adding to adsense than rich media / image ads?
Furthermore, there are no freeloaders in a system where publishers can set a minimum CPM floor.
that would be the case, if you could set a separate minimum cpm for image ads that come through their network, otherwise they sneak through and don't add earnings compared to text only. maybe you don't understand what the problem is: other, mostly image ads underperforming vs adsense text ads. you can't solve that with doubleclick.