We have had this discussions a lot. My POV on this is that I do not care as a bidder what the house charges me. I factor that into my bid. If others do not do this then I will likely not be winning as much and those bidders might find they are paying more.
One thing that is now a real factor is the sales tax we pay at almost all houses. Some buyers are sales tax exempt but most are not and that sales tax, while not kept by the house, is part of what we pay for the items we win. On graded cards, the sales tax is not included in the data that is collected by all of these apps and websites that give us sales info.
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