ember - 5:22 pm on Sep 8, 2012 (gmt 0)
Adsense has an accurate way to detect invalid activity. A site with more than 5,000 page views a day should not get over 3% CTR.
Hmmm....no. I've met with Adsense reps who have looked at my site with a higher than 3% CTR and said it is not a problem.