I'm using a used IBM machine right now! I believe I can give you an answer.
Because the quality of IBM and Fujitsu is better than that of other brands, so a lot of laptops are not bad, this is one of the
The second: the speed of updating electronic products in foreign markets and the purchasing power of foreign users are higher than that of the Chinese side. So most of the machines in foreign countries to have been out of date but many people in China have not yet used the laptop, so most of the out of the laptop influx of China's second-hand market.
Third: IBM part of the product is a rental business model, that is to say, the new machine rental to you for a few years, you give me how much money, and then I recycle, after the hand after the second-hand machines. Fujitsu is known as Japan's IBM can think of the quality is impeccable, I believe LZ you also know that Japan's electronics is the world's more developed, Japan's domestic purchase of electronic products is very cheap (I mean with the Japanese standard of living) they have a great ability to chase the laptop's newer trends.
Probably the above factors
above