Have botnet prices crashed?

Years ago, my friend John Gilmore told me he thought accounts of the spread of botnets (massive networks of virus-compromised machines that can be used in concert to send spam, attack servers, etc) were overblown, because if botnets were really all-pervasive, then the price of using them should have crashed. Now comes this spam, on one of my personal blogs, and I wonder, has the great botnet price-crash finally hit?
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