td22 - 9:10 pm on Nov 8, 2012 (gmt 0)
Don't know if it's a coincidence, but after hearing horror stories about redirecting rogue ads from the 3rd party network, I blocked them all, expecting about a 10% reduction in earnings...
To my pleasant surprise, CTR and earnings have risen.
I'm sure it will stabilize lower eventually, seems to be a glass ceiling of sorts.
Just happy we didn't take a big hit blocking 3rd party ads.
Your mileage may vary ;)