And yes there are times when some cannot always afford bigger quantities. But we’re not talking about 50 pound bags at Costco here; The price per pound for a ten pound bag of something at Walmart vs a six ouncer at DT is substantial.
We used to buy raspberries, blackberries, blueberries etc at Dollar Stores. They wouldn't last a week in the fridge which is why they were at the Dollar Store, but we were eating them same-day or next day so spoilage wasn't a concern. Really helped the berry budget with toddlers.
For staples that's definitely sensible but surely there are also times where you need one-off items where any extra amount would just be waste?