I was an idiot and gave in to eBay's constant pestering automated emails about offering free postage as a way to enhance my exposure in search result.  As my sales have ground to a halt over the past few months, I thought I'd give it a try.  To my surprise, I had one sale earlier today and then another 7 - to one person.

I don't want to have to roll up 7 posters into 7 tubes addressed to the same person and put them all through individually at the post office.  I can easily bundle them all into one tube for the price of a single poster's postage weight bracket, as I have normally done in the past.

When I send the invoice, putting in -50.00 (for example) into the "Seller discounts (-) or charges (+):" field and then clicking recaculate had no effect.  (That field has always seemed useless anyway?)

So I'm thinking I tell the buyer I will refund them (after they pay) for the 6 overpaid postage amounts, minus eBay's 10% fees on the postage components for each item.

A stupid situation to be in, and a smart buyer could argue they shouldn't have to pay such excess to begin with and that they shouldn't have to cover the fees on each item.  I know they agreed to the sale prices by committing to buy the items and they haven't requested an invoice yet or paid, so I think they are just as stuck as I am.

Any advice appreciated... thank you.