I use GA and run AdSense.
I’m worried, google has all the info about my site from their SE spider, their AdSense spider and their GA stats. They know where your traffic comes from, how much traffic you get, on which pages etc.
I think that’s a big concern, but i need the ad money and i can’t waste money on stats or be without them
The one thing that they know about my sites, that i don’t, is the exact pages and adsense ads that generated clicks and revenues. In theory they should use this to increase ad revenues for both of us.
The problem with google, is that it is google. Any huge player/near monopoly, has so much power that people are right to be concerned. How real those concerns are or what you do with that concern is the important thing.