koan - 7:58 am on Mar 1, 2007 (gmt 0)
Brett you seem to have put your own spin on the news title. Those 10% invalid clicks are identified as such by Google and are not charged to advertisers. What they are saying is that maybe 0.02% of those clicks are invalid *and* charged to advertisers. That sounds like peanuts and as long as advertisers have a decent ROI, I don't see what's the big deal, as long as Google is diligent with banning fraudsters. No advertising medium is 100% efficient.