Cancellara - 7:39 pm on Mar 17, 2010 (gmt 0)
All 90 Certified Ad Networks are for IMAGE ADS only, which are all CPM, and not CPC. CPM ads pay a fraction of a cent, whereas CPC ads pay 10 to 100 times as much.
I blocked ALL CPM ads 4 years ago, by emailing Google. I have no intention of ever turning them on again. Why displace CPC ads with CPM ads, when there is real money to be made?
For our account, its about 5 cents CPM for image ads with no clicks. You get additional "bonus" for every click from CPM ads.