As a buyer, I just look at the total cost and decide if I want to purchase. But, I do avoid auctions where the seller has a dirt cheap purchase price with the whole fee padded into the shipping charge.
I generally add about 50 cents to the postage on the small and lower priced items that I've been listing.
Postage is one of the areas that frustrates me. Unless a person is sending a letter, it seems that each postal clerk at our local post office has a different interpretation of the postal guide.
I can't discount the sale price of items or postage any lower than I have been. If I'm going to lose money, I might as well throw my items in the dump. At the rate I'm NOT selling items on eBid, I think that's where they will likely end up anyway. But, I guess that's the way it is.