I was caught out by this as I have not sold anything on ebay for about 9 months. I sold some of the DTs clothing in batches and added what I thought was reasonable postage costs. When I got to the post office to post the items, I nearly fainted with shock! The postage costs for a couple of the items were £2 dearer than I had estimated and the postage for all of them (I had 6 parcels) was higher than my estimate. Where possible, I used 2nd class post but for those over 1.4kg, I had to use 1st class post.
I emailed the buyers to let them know why the items were being sent 2nd class and for the ones over 1.4kg, I just told them that the postage cost was more expensive than I had estimated.
Well, one of the buyers for the heavier parcels reimbursed me the difference in postage cost and gave me a fabulous feedback and the others all gave me positive feedback.
At least I feel better now but I do wonder how many buyers will be put off because of the higher postage charges that sellers will inevitably have to use?