They send that generic out for anything and everything if they want to dump your account. And you really can't fight it. All you can do to "Protect Yourself" is NOT click on your own links and avoid as best you can posting your site in places that attract Adsense Saavy people. That's reality. Don't cheat and hope for the best. I took down a Forum from one of my sites yesterday. 40% of the site traffic is from Spammers trying to log on. The vast majority from .ru. I have ads on the forum. So what should I do? Should I keep pretending that spammers are not targeting my Forum and take my chances or should I just pull the Ads? Then how to I monetize the Forum? I chose to just kill the Forum. I actually have country IP Blocks on the site as well. They just keep hitting it through proxy after proxy. The Forum is still protected and able to weed out most spam, but not worth the effort. If you run a Forum or Blog and your site is popular every Viagra pushing Moron targets your site. You end up on list of sites and then the headaches begin. So try and prevent whatever you want. But it's a losing battle. And Google has killed accounts on sites pulling in 6 figures without a second thought.
I just don't understand with google with all there money they have nothing in place to prevent such clicks, while adbrite is a size of a peanut compare to google as a elephant adbrite has 3 clicks from a user then that user is stopped can not get another click in. In return the invalid clicks stop.
If you serve your ads with OpenX, you can set it so one banner is only displayed to the same user x number of times, and then a different ad is displayed.