If what I need for a good life is A, why should I try to grow after, let's say, reaching 2 x A - twice of what you need. Then you both have your income, maybe for some staff income but you also have for investing in the company and your pension.
What more people should strive to get is improved quality life and more money isn't equal to better life, kinda the opposite. I'm sure you could make a graph that has money as X and life quality as Y, it would go up to a certain amount of money, but then starts to go down again, as more money didn't really add anything to the quality of your life.
Let's say you have a car, what real value does car number 2 add? Nothing to your core quality. You have good spacious, not huge, home, but want more space, what does this add? Again, nothing to your core quality.
It's called ordinal utility:
