This seem to me like word on marble, like a wise saying. There is reason in the whole of the things you said before the above line. Truly if you have different means of income and good income, you can well take care of all your needs in life and in fact become a philanthropist, giving to motherless homes and the needy. Having much to spend will is the solution to a miser kind of life as you said life is too short but if you don't have much, then being economical is the option left.
Not everyone who hustles can afford the luxury in life. Some aren't so blessed with the fortune due to the physical and mental limitations. Spending too much with unnecessary things could be one of the reason, but hey we're all human, bringing pleasure to ourselves is inevitable after the long hours of working.
Some people may have hustled so hard, but not fortunate enough to have enough knowledge the value or worth of his skills. Millions of people are suffering underpaid.