signor_john - 2:05 am on Dec 20, 2009 (gmt 0)

Have you, has anyone, graphed their CTR over the past few years to see? Numbers like that might not mean much unless nothing has changed on a site/page over the years.

Also, we know (because Google has been quite open about it) that the definition of a "valid click" [adsense.blogspot.com] isn't what it was a few years ago, when an accidental click on the body of an ad would be counted as a paid click. Today, a user has to click on the ad title or URL to register a click that's charged to the advertiser. That's good for advertisers (who pay for fewer spurious clicks), and it's good over the long term for legitimate publishers (who benefit from having advertisers who are satisfied with their ROI), but it does mean that the network's average CTR is likely to be lower than it was before the change was made in 2007.