The point of a functioning market is that humans choose who they do business with. Both sides of the transaction are responsible for this - if you fill your shelves with trashy pulp fiction and there isn’t a market for that people stop going to your store.

Personally I try to go out of my way to purchase books directly from the author, publisher, a book store with a local presence, and online retailers in that order.

I’ve mostly cut Barnes and Nobel out of my vendor list for this exact reason, their book shelves are full of products I have no interest in - walking into their store has such a high noise to signal ratio that, unless I place my order in advance for a specific product, I don’t bother walking in anymore. The books of value are buried on shelves drown out by heavily marketed pop culture noise; and that’s if I’m lucky, often I have to have it ordered and shipped to store to pick it up locally. They don’t meet my needs for content discovery so I don’t do business with them very often.