I would say that this depends on your financial capacity. Plenty of people live paycheck to paycheck, and they almost certainly keep track of what they spend and how much they need. You can obviously afford to ignore more as you amass more of it, but even at comfortable levels, I'm sure people are keeping track of how much their next holiday is going to cost, how much they need to make for that dream car, etc. Even Bill Gates must be paying attention to how much certain things cost (maybe that next jet or private island lmao); it just so happens that normal grocery items are already so far beneath him that he couldn't even come up with a range.

It can be easy to fall under this perception if you're satisfied with where you are, but ultimately, it's not just a number. The only time you don't realize that it's there is when you don't need to use it for anything.