Media.net (Bing and Yahoo contextual ad network) also paying a good CPM for all counties. My highest was 3.5$ for USA & India Impressions.
I am also using media.net for some 6 months now and 85% of my traffic is from US... Initially I really liked their CPM, it was around 4 dollars but slowly it came down to few cents and now it's 0.1 or 0.2 most of the days... For some 20000 impressions I made only few cents in last few days.. I am trying to tag along with technocrati media these days.. Must say media.net has the best support I had ever seen in 3 yrs of my blogging..
You're absolute right. The same things happens with my analytics using Media.net. The amount took down day by day but their support is better than others but earnings also matters. Now I am using Tribal Fusion replacing Media.net ads. While CPC based Adsense is the best ever.