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Online advertisers estimate that about 14.6 percent of the clicks on ads for which they're billed are fraudulent, costing them about $800 million last year, according to a study released Wednesday.
Study: Click fraud could threaten pay-per-click model [news.com.com]
you don't like cpm, we don't like cpa, so let's meet in the middle and don't let greedy advertisers disturb the market balance.