The shipping price was there before you bid and by bidding you agreed to it. You do not have a valid reason to retract.
I'm sure as a seller, you would not want any of your bidders to retract just because they didn't notice the shipping until after they bid. Besides, it is possible that you might be outbid before the auction ends.
In the future, look at shipping prior to bidding, not afterwards.
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Non payers should get unpaid item strikes and be added to block bidders lists. Period.
