Actually, this is also a business tactic. It is possible to lose money, but it is mainly to attract people to look at his other products. Even if he loses money, it is not a big loss. The charger usually costs 10 yuan, and the airmail is 15-20 yuan, so the loss is only 30-40 yuan. Besides, usually someone will think like you in the last few minutes, and he will bid 10 US dollars, and he will make money.