http://www.reddit.com/r/Bitcoin/comments/304rhd/why_the_fck_are_we_dropping_faster_than_a_fat/
"Evolution market just exit scammed, and now if you head over to /r/darknetmarkets you
can see that Agora, the second largest market (now largest), has just said they're going offline for
24-48 hours for a "security update." People are extremely nervous to say the least. If Agora runs off
too then that's basically the entire real economy of bitcoin going poof."
Per the Whale Club, Agora is back up and running.
They pretty much unchallenged now and got the monopoly. Would be just dumb to run at this point.