Sold some items a few days ago.
I stated CLEARLY that buyers should allow up to 10 days for delivery, as I work full time and dont get to the post office that often - and that they should take this into account BEFORE bidding.
I then emailed everyone who had won my items stating the same in a polite, friendly way 'Just to remind you...' etc.
Have had three complaints already, and one person who wants a refund.
I also sold a beautiful £150 coat brand new with tags for an absolute pittance, took it the post office and they asked for silly money to post it - much, much more than I estimated and much more than the royal mail site estimated. I explained this to the buyer, in a very polite, 'this is a bit of a problem what shall we do?' way, thinking may be we could split postage costs, and she was vile, , wants a refund and is giving me bad feedback.
Honestly? Fuck Ebay.