Apparently you've never lived "paycheck to paycheck" before. I can remember a time in my life where I would be so happy just to have an extra $100 at the end of the month. This was living with roommates, never going out, and bringing my lunch everyday. No frivolous spending at all.
God forbid you have to fix your car, or some other unexpected expense. That $1,000 it took you 6 months to save is gone in an instant.
While I'm much better off these days, lots of Americans live the way I just described. You can't save what you don't have.