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Rosalind - 12:49 pm on Mar 20, 2007 (gmt 0)
The trouble is, there's no algorithm that can automatically factor in the price of a service. It's free to set up a blog on Blogger, so it can be abused more easily. If these spammers actually had to pay for a new domain name every time they set up a splog, they wouldn't bother.
My first reaction was, this is news? I agree with ebound, 9 out of 10 would be a reasonable estimate. But they were only looking at splogs with high enough PR to actually figure in the top 50 on a certain search. There are probably far more that pass under the radar, and individually only pass a small amount of link juice.