World's worst business ideas -- Selling serial killer memorabilia

It takes two people to execute a truly awful sale: a creepy vendor and a creepy buyer. Unfortunately, there must be enough creepy buyers who collect the letters, post cards, and other personal memorabilia of serial killers to keep creepy vendors like serialkillersink.com in business.

I'm at a loss to explain why anyone would pay $375 for a photocopy of Charlie Manson's 1969 driver's license, "perfect for framing for the ultimate Charles Manson fan!" Who in their right mind would be a fan of this murderer?

How about a two-page typed and signed letter from the Son of Sam killer, David Berkowitz, for $80? For creeps on a budget, how about $12 for a one-page letter from Michael Carneal, who killed three of his high school classmates while they were in a prayer circle?