After reading your post, I decided to check my Google Adsense reports.
You are right. Something appears to be going on.
Back in 2004, Google paid market rates for ads. After they acquired DoubleClick, Google was able to gain a monopoly and started dramatically undermining the publishers who used their service.
A few years ago, Google was running the dregs of its ad inventory on my sites and I was getting less than a dollar per million page views. So, I yanked their ads from my sites.
I left a few ads on some legacy pages.
I logged in and Google was suddenly paying a decent ad rate.
I think it has something to do with the lawsuits against Google. Several of the lawsuits focused on how Google undermined the publishers who foolishly ran their ads.
Personally, I wish someone would create a decent alternative to Adsense. It would not be hard to do. Unfortunately, most of the companies that go into advertising are as shady as Adsense.
There is definitely something strange going on with Google.
I guess the best alternatives are Bing and Facebook ads.
Posted via D.Buzz