I'm pretty sure the email got farmed from my updated DNS record.
I really don't understand why this occurs. It may be nearly costless to farm these addresses, but do they really think "hey, if I cold-call this new email, they're bound to get a subscription to my pr0n site!" or is it a case of "even if they click through to investigate the source of the pron, to try and shut it down, it will register a hit on the clickthrough and will generate a fraction of a cent of income from ponzi.clickstream.com, and I'll be at a new macro-generated website address tomorrow, anyway"
The perils of micropayment and the long tail, I guess. At some point, the content is so worthless that the price is some infintesimal but non-zero value, such that each consumer (the spam receiver) notices no drain, but the aggregator gets rich quick because the transaction is repeated many multiples of times. This is like a sick "Superman 3/Office Space" style scam, I guess. The cost of spam is less than a fraction of a cent, and it is getting rounded off into the spammers pockets.
Newsflash: Joanna was right- it's still stealing.