> It doesn't matter how rich you are, if you are not careful you can spend your entire income and have nothing left.

Really? I mean, I hear people (especially SV people) say this all the time but I make a fraction of what they claim to and I rarely even have to think about money.

You are a minority from what I can tell. Most people spend whatever cash they get. Which is why automatic savings plans are commonly recommended - if the money is never seen you don't spend it.

I'm not sure the above is entirely bad - when you die the money is gone. (this is a religious question - not all agree) You need some savings for unexpected, retirement, planted larger expenses, and other situations. Beyond that, if you have money left over that you didn't spend you wasted your time at work: get a life.