I just noted something interesting I had a really good ctr, however adsense had cut my earnings for some reason that they did not told me. So i noticed that I had turned Interest-based Ads Preference --> Off. I turned it on and the next day CPM was high about 3 times and after some ad adjustment 9 times. But after that day it again dropped so I turned it off again and CPM again went high. Seems like google trying to eat my earnings for some reason. Regards