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Per this article: New companies entering the business of fighting click fraud deliberatly use scamming technology to jack up fraud clicks and compare their numbers with what Google reimburses advertisers for bogus traffic. Not sure how that does any good for the guy who paid for the bogus traffic, but from this article it seems the subject, and the complaint level, is starting to get ever more hot. And that is good.
It's a problem long overdue for more attention by Google and OV, the only worthwhile PPCs left.
The fact of the matter is that it's always better to filter fraudulent clicks in the click stream rather than relying on post hoc analysis in order to try to argue for refunds.
You could spend a few hours gathering the requisite data only to get $50-$60 in refunds. The economics just aren't that favorable at this point, at least for the major engines like Yahoo and Google.
In our network, we filter out fraudulent clicks in the click stream, and it's been extremely effective in protecting the advertisers from fraud.