hazek: You are actually totally wrong about all your points. This volatility has nothing to do with clipping the orders way outside of the normal price range or darkpools.
1) The market was this volatile or even more before darkpools and before I clipped the order book.
2) You can't see the complete orderbook for any currency pair. There are dark pools for every currency pair. There is so much more hidden info for every other currency pair on earth. Yet all have less volatility.
3) The merchant problem is easily solved by not holding BTC like I explain above.
4) Multiple exchanges will only increase volatility since each market will be thinner. The only thing that will decrease volatility is liquidity. It may seem like there is a lot traded a day but it is really nothing compared to any other currency pair.
5) The recent crash had been building for days since the peak. It was predicted by many people. It was greatly exacerbated by one person dumping a ton of coins. If they had used a dark pool instead there wouldn't have been such a huge drop. So actually use of the dark pool would have decreased volatility.
6) Look at this chart:
http://mtgoxlive.com/orders <- see all those straight lines in price. Those are dark pool orders being hit. They are reducing volatility as you can plainly see. If they weren't there there would be spikes instead of straight lines.
I should have used a different word for it other than "dark pool". I guess "dark" scares people and they don't understand it. So when something happens... "The market crashed. It must have been that evil dark pool that confuses me!"