Yeah my dude, I'd almost venture to say that you are the outlier here (echo/bubbles, yay!). For many that I know, food is an on-demand lazy loaded resource. Sure, sometimes they buy groceries (usually when they run out of pop-tarts) ... But the odd day when they actually cook dinner, it's a trip to the store for just those ingredients that are necessary.

Is it horribly wasteful and inefficient? yes. Does that get factored into the equation? no.