It's not so easy to get money out of China by buying BTC from the exchanges. First, you need a valid bank account before you can put money on the exchange. Second, you need more verification before you can increase the daily 10BTC withdraw limit. Moreover, all these transactions are recorded by the exchange. I don't think anyone who wants to bring a lot of money SECRETLY out of China will use exchanges. There are many other ways for them to do that with much less risks. Even if they choose BTC, they will buy them from others out of exchange.
Yes, you are correct.
I was commenting on Bitcoin as a currency being special for them, not specifically about Bitcoin bought from BTCChina
They can transfer money on their own, at home, without middle man and black market exchange rates
No way.
Hardly anyone buys with bank accounts these days, every Chinese has an Alipay(or Tenpay) account, it's instant, friendly, versatile, and 24/7(just reminds you how much of a dinosaur the banking system really is)
It's actually part of the reason why China's volume was so crazy, we can move huge bunches of fiats into the exchanges nearly instantly, unchecked by banks.
Just thought about this myself as well after spending the whole day thinking how to most efficeintly deposit money to btc-e without using sketchy russian services like this http://www.ecoin.cc/ and then waiting 10 days. Apparently there is no way around it unless you have a loaded mainland account.
Now I am a little worried. What will the government do once they realize this. 
