> Sellers just have to assume a 10% loss of gross margin due to issues like this. It's not the end of the world, but that's where the cost is. This explains wh

> Sellers just have to assume a 10% loss of gross margin due to issues like this. It's not the end of the world, but that's where the cost is. This explains why individuals selling individual items, or a small number of items, can get so burned too. You need sufficient volume to cover all the inevitable bullets you have to swallow.