It's actually a rough indication of your wealth; there was an article the other day that categorized people by wealth based on what purchases they don't really have to think about (can't find it in quick order). Not having to nitpick about common groceries puts you comfortably in the middle class; the next step would be the ability to just go on vacation several times a year without really worrying about it. Then it's stuff like cars and big purchases like that, then houses, then idk, yachts? Elections? Countries?