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@fromauntylynnie wrote:

"3. Go to "Help" on any page & read up on Fees" ...... why this does not explain anything

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It does if you take the time to read it.

It shows that fees are inclusive of GST, that the fees are charged on the total transaction amount  & international sale fees.

Again, as to why these fees are charged... it's eBay's site & is covered in the T & C's.