Wired has an interesting article on spam and why spammers keep doing it.

MANCHESTER, New Hampshire -- A security flaw at a website operated by the purveyors of penis-enlargement pills has provided the world with a depressing answer to the question: Who in their right mind would buy something from a spammer?

An order log left exposed at one of Amazing Internet Products' websites revealed that, over a four-week period, some 6,000 people responded to e-mail ads and placed orders for the company's Pinacle herbal supplement. Most customers ordered two bottles of the pills at a price of $50 per bottle.

Do the math and you begin to understand why spammers are willing to put up with the wrath of spam recipients, Internet service providers and federal regulators. [Wired News]

Even for the money, I just can't see doing that. It would just feel too slimy.