So bad that bitoption is closed...If you're right you can make a lot of dollars shorting bitcoin.
I think Ruxum is going to add derivatives, I'll let you know.

Seriously, I think is going down because of the attack on mybitcoin, the attacker probably sold it all.
Maybe bit-pay and BTCinch selling too much?
I don't think so, but that's going to be bullish for btc in the long run anyway.