Tax on the Stupid
Sigh. Repeat after me: Just because it's on the Internet doesn't mean that a) it isn't still illegal and b) the authorities won't lock up your ass for doing it.
Just as it was stupendously inevitable and obvious that the government and media companies would hammer Napster, Pirate Bay, and other such enterprises, it was abundantly obvious that at some point they would step on Silk Road.
Were these guys really so stupid that they didn't expect the feds to show up? For that matter, do their customers think that they won't also get nabbed?