Why should that not be the goal for everyone, rich and poor?

And why are so few rich and so many poor?

Because how you spend your time is different when you need to work for a living and when you do not. If that's not transparent, this can't really be discussed. Spending 4 years and $300,000 is "fine" if you have a trust fund and "extremely stupid without a return-on-investment" if you don't.