Not your fault or problem. You can mitigate it somewhat by only using US Post as you international carrier. I won't buy anything from the USA if it shipped via UPS, FEDEX, etc... Their brokerage fees are insane.
You could be helpful and include "Brokerage, customs, duties and taxes are not include in auction close price or S&H charges", but really you're gold either way. They should [censored] to their govt., not you.
