Don't ask questions, because this is what you might get. I don't even know what they are talking about. I just follow whatever they tell me. I've never had anyone click my ads or myself. Oh well, the ads were annoying.

Hello,

After reviewing our records, we've determined that your AdSense account
poses a risk of generating invalid activity. Because we have a
responsibility to protect our AdWords advertisers from inflated costs due
to invalid activity, we've found it necessary to disable your AdSense
account. Your outstanding balance and Google's share of the revenue will
both be fully refunded back to the affected advertisers.

Please understand that we need to take such steps to maintain the
effectiveness of Google's advertising system, particularly the
advertiser-publisher relationship. We understand the inconvenience that
this may cause you, and we thank you in advance for your understanding and
cooperation.

If you have any questions or concerns about the actions we've taken, how
you can appeal this decision, or invalid activity in general, you can find
more information by visiting
http://www.google.com/adsense/support/bin/answer.py?answer=57153.

Sincerely,

The Google AdSense Team