One of the frequent stories to hit the grapevine was someone putting up a common item at an insane price point in Jita or other popular trading system. And people would buy them (rarely, but consistently).
Something like a piece of an asteroid ore at 50 million ISK.
It's not exactly a crime, but for me it definitely sits in a moral grey area, somewhere between American Health care and selling bottled water in the desert for $1million/bottle.