From Slideshare.net: Chinese have realised early the price of luxury goods is much cheaper abroad. However, most of people are actually unable to travel overseas as often as they’d like, so purchasing agents (Daigou, “代购”) are emerging quickly in China. Based on scale and motivation, they can be divided into amateurs, specialists and masters. Masters and Specialists are the main focus of  online discussion, for the mature purchasing model and a wider variety of brands and products.

转自Slideshare.net：尽管众所皆知国外的奢侈品价格要比内地便宜许多，但大多数人并非能经常出国，这也是近年海外代购在国内蔓延的主要原因。代购者可分为私人代购，职业代购人，职业代购机构。后两者因其完整的海外代购流程服务，齐全的产品种类，成为网络交易和探讨的主要对象。关税调整对代购价格影响很大。

Resonance China