Originally Posted by David Jackson
A percentage of click fraud, yes. But with Google and Yahoo's resources, you shouldn't have to calculate for excessive click fraud, which is why they lost their lawsuits in the first place.
I think it doesn't matter if there is click fraud or not. You simply have to see if your campaign is profitable or not. For me it didn't worked when I tried last year for 3 months so I stopped and now planning to try again. I think when business is new you should evaluate carefully what works and what not. Otherwise you might be spending lot on adsense and not making a little money.