Basically Macau is a place next to china where they go to gamble. It's like Las vegas... but bigger. So why is it potentially so important?
From this article:http://www.foreignpolicy.com/articles/2013/01/28/broken_tooth_and_new_macau_gambling_china?page=0,1
Triads get a piece of this new action by dominating the "junket" industry of Macau, which brings high-rolling gamblers to the territory and collects debts on behalf of the casinos. These businesses also allow VIPs to stake more than the $50,000 legal limit on how much money Chinese are permitted to take out of the country every year. (In essence, junkets collect their clients' money on the Chinese side of the border and give them loans to gamble on the Macau side.) This scheme makes a convenient vehicle for money laundering. Steve Vickers, Hong Kong's former chief of the Criminal Intelligence Bureau, has said that he knows of "no Chinese junket operator that doesn't have some association with triads."
Bitcoin could totally bypass these junkets.
another article:
http://www.nytimes.com/2007/01/23/business/worldbusiness/23cnd-macao.html?_r=1& Macao surpassed the Las Vegas Strip to become the world’s biggest gambling center in 2006, measured by total gambling revenue, according to industry analysts and government figures released today.
