As a matter of coincidence. It is well known that China has been known in those days just milking of animals on the farm. Once rolled out, many consumers simply do not run out. With milk products are very expensive.
As a matter of chance, because it is known that China only recently have recognized milks from animals belonging to the farm. When rolling out a lot of it was not completely consumed with milk is a very expensive item.
As a matter of coincidence, because it is well known that China in the days that had been known as the milk from the pet on the farm when ironing out many of consumption, is not all the milk products are very expensive.