Im about to sell a symbolic 0.001 bitcoin at USD10,000. whodathunk?

I’m pretty new to this and I’ve been trading on Gatecoin as I’m in Hong King. In the past the order books had a fairly defined Bid and Ask paywall at around 10 coins with a fairly consistent spread and Trading amounts were generally between 0.1 to 3 or 4 coins. Recently trade is dominated by hundreds of 0.01 or similar trades which are regular but add up to high volatility but low volume. What’s driving this?