The overhead for listing everything online isn't worth it when most of the items are like a $2 cup that they only have one of so every single item needs it's ow

The overhead for listing everything online isn't worth it when most of the items are like a $2 cup that they only have one of so every single item needs it's own listing and photos. And then there's the problem where someone buys it online but someone has already purchased or stolen it since the listing was created.