Let's say your company has suddenly begun to lose sales or your website is simply not performing up to expectations.
Web analytics is an inexact science. Good news for the sellers in the traffic industry where 10-15% is considered a normal discrepancy between the publisher's and advertiser's campaign statistics; not so good news for the traffic buyers. This error margin is a fertile soil for a traffic inflation cottage industry (see Brittany Thompson's recent article PPC Guerilla Tactics in WebProNews).You know there is a problem when Google in its pre-IPO filings cites click fraud as one of the potential risks investors should worry about.