Yeah, Craiglist buyers are just as dumb. I've seen old PPC minis that sold for more than new current minis!
It's useless to ask "why". There's a million reasons. Ever wonder why you get those nigerian scam emails? That's right, because they work. There's always plenty of idiots who get taken in. I certainly don't support the scammers and hope they all end up in jail, but it's hard to feel sorry for the "victims". Sometimes folks are just too stupid to hold onto their own money. In the case of ebay and CL, well, people are stupid, and there is no cure<shrug>.