Hilarious story in Wired News today in which they try to buy things mentioned in spam. Maybe it's ironic instead of hilarious: most attempts to buy or get more info fail, but their addresses get resold to other spammers. Is there an entire spam-to-spam industry in which people are moving chits around representing money for email addresses? Possibly. The stuff they do manage to buy is mostly classified-ad fraud/misrepresentation stuff practically: photocopied instructions that tell you how to perpetuate what the spammers are doing or information that's available for free (and not a 10th-generation blur).
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