Because in the end you will be dead. And when you're dead it doesn't matter if you have big funny number on a screen or little funny number on a screen. When you're on your death bed all that matter will be if you enjoyed life. If you did the right things. If you stood up for what's right. If you were happy. How you used your time and your money.
Money is worth nothing. It has a value in goods and services. But its value isn't always what it's worth.