You see the Google AdSense, "I've Been Banned" type of threads at all the major AdSense forums. Just recently I have been seeing an influx of Yahoo! Publisher Network threads on the topic of account termination.
So what does a typical account termination email look like?
We have terminated your Yahoo! Publisher Network beta account [ACCOUNT ID] for breach of the Terms and Conditions and/or Program Policies. Your breach includes but may not be limited to sending traffic from users located outside the United States, in violation of Section 11(l) of the Terms and Conditions. In accord with Section 6(a), we will not include such amounts in your payment. We have refunded amounts generated from the non-US users to our advertisers and will pay any remaining amount owed to you in accord with the Terms and Conditions.
People take this to mean that Yahoo! will ban people if the site gets international traffic. But it seems to me to mean that there was unusual click activity from outside of the US.
Recent YPN ban thread:
