Hong Kong is the gateway to a growing thirst for fine wines in the Far East, particularly trophy labels such as Lafite, Domaine de la Romanée-Conti and Pétrus. Buyers come from all over, but the big bidders are mostly from mainland China. The country counts an estimated 800,000 millionaires and the number is growing by the day. More and more of them want to get their hands on great bottles of wine to serve their friends or to give as prestigious gifts. It's all about gaining face.