Supposedly they won't count ads that show to you (the account holder.) You are not allowed to click on your own ads. If you do so too often they will disable your account.
I hear a lot of stories of people who have had their adsense accounts disabled for rule violations.
I have seen personally and heard from other Admins that ad revenue in general has dropped a lot in the past year- and this time of year is generally the best paying. It was getting so bad I decided to drop adsense altogether, it wasn't worth having at all.
Skimlinks and viglink type places bring in more revenue on a forum like mine then adsense ever did.
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