Thanks for your reply, but you are missing entire point of the post.
When Adsense was reduced from 100% of the ad rotation to only 10% of the ad rotation, revenue stayed the same. It did not decrease at all.
When it is set back to 100% ( i.e. there are no 'distractions' ) revenue stays the same.
Site traffic has been increasing year to year consistently.
The important point here is that f I deliver 10,000 impressions in a day, revenue is the exact same as 100,000 impressions. We're talking one day to the next, not over a few months.
I can set Adsense to 100%, deliver 10 times the impressions, let it run that way for two weeks, doesn't matter. Same average daily revenue cap.
I know the traffic is valid, because we keep exit click reports on our direct ad campaigns and the rate is similar to what Google reports and conversion from our advertisers are excellent ( 14% from click to sale ).
Given those numbers, there's really nothing else to be looked at. My guess is that Google caps the ad revenue for a site so that they have enough ads to display on all sites.
There's nothing illegal about throttling ads, so there would never be a government investigation as you suggest.
I'm trying to see if anyone else has done a similar test on their site and sees the same thing, and if there's any way to break through a cap like this.