Mailing the story:

Everyone who buys pay-per-click advertising worries about the loss-potential posed by click-fraud. And rightfully so. Any disgruntled employee, shady competitor, or seedy entrepreneuer can unleash a click-fraud campaign that takes money out of your pocket. So what's a savvy businessperson with a tight wallet to do? Email Battles ran a painful test, the results of which may offer some useful insights.