Wang Chi-hsiung says that private collectors tend to have a few weaknesses. When they lack funds, they'll trade their holdings for money. When they grow bored with something, or have two or more specimens of the same variety and start to hanker for something new, they'll often be willing to sell.
王基雄說，私人收藏家其實有些毛病，缺錢時就會以貨易錢，玩膩了或者有兩件以上同類物品，也會想換新，這時就好出手。