Idk - everyone I see there looks like they're shopping for a family. They're a wholesale warehouse like Wal-Mart is/was a wholesale warehouse... it's still meant for individuals.
I can’t buy bulk food at Wal-Mart like I do at Costco, I agree with the comment you’re responding to. Costco sells in bulk which causes the prices to be lower (or seem lower, relatively) and I know of quite a few restaurants who source their ingredients from there, which may make up some of the people you see with carts loaded with things like coffee or tomatoes.