Those going abroad are usually older and expired WGs.
Same shit in HK, I havent seen a HG that is < 20 yos.
In china, when u reach mid 25, you value drops when it come to be in this business.
Market in China is skewed towards young babes < 20yos, the younger the better. Fresher and less tear & wear.
So, that;s why they move abroad for secondary market. The law of equilibrium and scarcity. Common sense.
Try send a Chinese HG to Africa or South America,.....I bet she;ll be a millionaire in less than 6 mths.
You will experience and learn more when you punt internationally.