Dorm Ring racked up more than $3 million in two weeks.

Yes you read it right, three million US dollars ($3m) worth of fraudulent click in just two weeks. The fraud dorm ring being run out in China which involved 200,000 different IP addresses identified by Anchor Intelligence. "As long as advertisers pay for clicks, there will be click fraud. And the more people combat it, the more sophisticated the attacks become to get around the defenses that advertisers, search engines, and others put in place. But a recent click fraud ring discovered by click-fraud monitoring service Anchor Intelligence suggests that the practice is evolving to a scale never seen before." (2009, Techcrunch)