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@smiling.susan2011 wrote:

If you really think someone has overcharged on postage question them about it and see if they react.  Some people will reduce their postage costs if you stand up to them and prove they are overcharging you. 

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and the best time to question a seller about postage is before you bid or buy.  Once you bid or buy you are accepting the postage charge as listed by the seller UNLESS you have messaged them and got a commitment towards a lower price.

As far as "standing up to them and prove they are overcharging you", sellers are under no obligation to reduce the price of postage once you have committed to buy.  If you can prove to a seller that they are overcharging on postage before committing to bidding/buying that will not get you anything except maybe being put on their Blocked Bidder List as they may feel that you would be a problem buyer should you eventually buy from them.  Proving they are overcharging on postage after committing to buy is wrong, as the act of committing to buy is an acceptance of the postage rate.

Members may feel that sellers have a moral or ethical obligation to offer genuine combined postage rates, but these are not concepts that eBay impose as a pre-condition for being able to sell on eBay.  If you ask the seller a question and get the run-around regarding combined postage or postage rates then my best advice is do not buy from that seller.