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One of the reasons for Google to not allow your ad’s to display is to discourage manipulation by publishers of the market price for ad’s that show on your web site. I think one of the reasons Yahoo! has recently changed their ad display from the “highest bidder” to now include CTR data as a factor, is to become more competitive with Google in the content network, by becoming less easily manipulated.
[edited by: Powdork at 1:22 am (utc) on Dec. 6, 2006]