It would be, but do you think sellers will list their records cheaper if they have to pay for high listing prices? They will just not list them at all.
Some 15 years ago I was in a record shop in Antwerp and I overheard the following story: there was a record shop famous for their high prices. And of course, all the expensive stuff didn't move. Till one day some guy came in, bought 15.000 euro worth of expensive records, and left again. While he could have gotten those records cheaper in other record stores.
Same on Discogs: many people list their stuff for unrealistic prices just in case that guy would pass by. "I don't really want to sell it but if some guy gives me a crazy price for it, I'll sell it". They'll never price those records at a fair price.