Not really sure.
The problem with bookstores is your inventory only ever increases. They probably made some cost calculation that carrying multiple translations of Homer translated to a few more sales a year. It's a hard business. I've wandered in there and found esoteric history, the kind that I was surprised they even carried. You add Homer #2, something like that gets axed.
Maybe they could stop selling the kind of books that are really big for a year and then nobody ever reads again, but it can't be easy.