I think that it's your own fault if you are upset about the postage. As someone else said, the fee was disclosed on the auction, and you therefore had an option not to bid on the item. As someone that DOES measure out and charge very accurately, I would think you'd spot that the shipping/handling fee was way off anyway.
Sometimes it can be misleading though. What may seem like an appropriate charge for shipping and handling at the time you're bidding may not seem so when you receive the package. I remember paying for a pci card once. The shipping didn't seem too far off. When I got the card, however, it was simply tossed inside a box (freely moving around.) Had I known at the time that the seller would ship it as such, I definately wouldn't have thought the shipping reasonable.
A lot of the time it is obvious though. It's not uncommon to see someone listing an item undervalue and then trying to make some of that up in shipping and handling fees. (Easy to avoid.)
I
never list shipping fees on my auctions. If the item goes for roughly what I think it's worth, I'll charge the price it costs me to ship exactly (I don't take in to account for anything else.) If I wind up getting more than I hoped for, I'll frequently cut the buyer a deal on shipping.
