Over-consumption? That doesn't follow. I sustain my family on Costco, going once a month or so, but have to feed four people, including two teenagers that consume way more than 2000 calories a day. You keep using the word "oversized", but that assumes the SUV, the fridge, the trolley are not suited for purpose. But they are!
I think what you're really critiquing is people who don't shop frequently, and therefore buy in bulk.
I think what you're really critiquing is people who don't shop frequently, and therefore buy in bulk.