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I'm guessing the reason is that sometimes people want the seller to lie about the cost of the item in order to avoid paying full duties. And then refuse to accept the package after it's been sent,...

It's in the "add or remove options" tab of "Choose how you'd like to sell your item".

I'm not sure how much you spent, but the first and last time I sold razors in bulk I lost money, and the buyer just unpacked them and relisted each with a starting bid of 9.99. I won't ever do that...