In a land with true capitalism these wouldn't exist because every single store with them would instantly lose all their customers. The only reason this exists is because America doesn't have a true free market or capitalism (because that's impossible) and stores are using their market position to force customers to shop there even though they would prefer not to. What are customers going to do? Go to the other massive grocery store that's miles away? Or maybe shop at the boutique that has half the selection at a markup.