Some guy managed to scam a huge amount of bitcoins on 4/20 'sale weekend' where the site doesn't charge escrow fees, so there's a crazy amount of orders. Tony, their so-called Top #1 selling vendor decided to make hundreds of listings that were auto finalized instantly then disappeared. The estimated loss is at least 100k in bitcoins. Has to be the biggest bitcoin scam of all time, even better than the 643BTC that guy goxxed out of MtGox back in 2011. (allinvain huge loss doesn't count, never was any proof). He also lured fools off site to scam an unknown amount through a secret store he set up.

TONY 2012 - invisible drugs