I'm just a newbie, but I thought I remember seeing something about dark pools. If you are going to dump 9.5K bitcoins, wouldn't you use a dark pool so you didn't crash the market. It's doesn't help the seller that his coins are selling for smaller and smaller amounts.

Also, if you are concerned about holding coins during a crash, is there a way to put in the equivalent of a stop loss order with the exchanges? I.e., get me out asap if the price falls under $X. So you don't wake up and see you've lost 50%.

Plus, any seasoned trader knows that if you know there is going to be volatility, you can make money. Make volatility your friend. Put in lowball "bids" and amass coins at the bottom of the range. Larger orders at increasingly lower, and potentially ridiculous bids.