The robber makes plays to dump his illegally acquired currency on the market and launder it into clean money, and while dumping he accepts prices that the original owner(s) would never have considered, simply because he's seeking to convert it into something untraceable before he can be apprehended.
I am kind of thinking that some day in the next couple of years, we are going to see a large bitcoin bust, and we'll get to make up our mind in the media whether the perp was the legitimate owner and is persecuted, or if he's a thief and should go to jail.
I don't think they will ever get Pirateat40 for his First Pirate Savings and Trust scandal. I'm not even sure that there's any law enforcement who is out there looking.