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No doubt Googles reponse is to use some incredibly sophisticated algorithm that decides perfectly who is guilty and who is innocent with the aid of some expert mathematical analysis.
You know .... like banning a whole hosting company.
Now, if only Ultimate Search would stop buying all those good ones!.....
However, since Google seems to be dumping those sites a LOT faster now, perhaps that "industry" will dry up.
I saw one site that we were somewhat interested in that expired that dropped from PR4 to PR0 in less than a week once it was taken over by one of the domain name purchasers. They still wanted too much for it, so we did not buy it, but I thought it was interesting how fast it got dropped.