Jeff rightfully pointed out that porn, while supposedly the seedy underbelly (there's a bad pun in there somewhere, I just know it) of this interweb thingy, is also quite possibly one of the most [only?] profitable sectors.
We were driving back from Rick's on one of those zero-traffic nights where the space between your friend's house and your own gives you more time to converse than is probably good for you. We'd spent part of the night's socialization talking about various spam-stopping methods, which of course led to the discussions of the worst/most disturbing spams we've each received.
Granted, I have a nice little antispam program that munges any and all HTML in emails it thinks are spam; therefore, I can open such spams as catch my eye and look at them without worry of being tracked, logged, bugged, spied upon, or just generally bothered.