Could China's thirst for fine wine, empty the cellars of the western world? That's the question being asked ever since Hong Kong has become the centre of the global wine trade, with more money raised at wine auctions there than in London or New York last year. Whether they're top officials who want to show off to their friends or successful entrepreneurs who want to use their money to build cellars to rival those of their business partners, the Chinese are buying up a lot of the best vintages, leaving less for collectors elsewhere.