We live in a small apartment. We drive a small car. The pantry has a good amount of dry bulk & canned food, but we largely shop one week at a time.
Sure, we could "lock in" on two or three foods, buy weeks worth of them at a time, and save some money. But like most people we like a bit of verity. It's just not possible to buy such massive quantities of things with nowhere to store them.
What I want is an anti-costco. More like a bodega. Still curated, maybe a larger mark-up, but smaller quantities of everything. Half loaves of bread, small bags of frozen veg, enough sugar or flour to bake just a couple batches.