Yoou win some you loose some........ if someone told me the postage had gone up AFTER the auction I wouldn't pay it....... if I then didn't get the item because it wasn't sent due to this it'd be negative feedback for the seller stating this ....
I have had to swallow postage costs on several occasions due to misjudging the cost..... sold an item b4 for £1 + £5 postage and it cost me just over £7 to send it.....lol.
Do you know anyone who actually has an account with Parcel Force or similar as they get a good discount from advertised prices and this could save you a few £££