Comment by mft_
8 hours ago
You’re not mathematically wrong, but you assume that everyone has a rational disciplined approach to their finances, and a reasonably stable income behind that.
And for buying in bulk (which is basically what Costco offers) to work, you need a larger amount of available cash up front, and a home with sufficient safe space for storage.
And of course you need some sort of transport to bring your bulk purchases home from the Costco, often built on cheap land away from dense housing.
As someone who has shopped at Costco using public transportation, that’s where your IKEA bags come into play. And you avoid bulk liquids at all costs.