Because when you get paid by the hour, you don’t want someone to get a larger slice that didn’t earn it.
It’s a zero sum game.
That money is what you traded for with your time and effort.
However, when we talk in terms of community, no one gets upset that someone volunteered less than someone else.
Because we are trading our time for something else.
We used to do all sorts of things for free. But thanks to industrialism, trading our time is our job.
Your purpose isn’t to grow profits. A whole world opens up to us when we find new ways to measure.