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Halfdeck - 9:19 am on Oct 26, 2007 (gmt 0)
Google needs to stop expecting webmasters to comply. They will never comply. Google has the money and human resources, so pour them into developing a better set of algorithms.
If a buyer's ranking doesn't change, there's no reason to stop paying for a link, even if a TBPR 7 page now reads TBPR 2. The real PageRank remains the same.