Craiglist is used for mostly legal things, the silk road exists only to serve an "illegal" purpose, which is selling drugs. I'm not all that familiar with how they stay anonymous, but if there's a way to unravel that system, it would come through cases like this most likely. I think this guy got busted for selling drugs outside the silk road, as per the article, and was overall a stupid drug dealer. A quote about human stupidity and why we can't have nice things (for a user the Silk Road is heaven.. till they OD) is in order I suppose.
What's stupid is this article.. and I do understand how oft-mentioned this is, but do the editors perform