[planckscnst]

I think that would lead to segregation and a feeling of resentment among individuals who feel like they've contributed significantly but haven't received anything.

Also, there is that paradoxical concept where it is pleasing to volunteer a service, but the minute you are paid anything, if it's not enough to make a happy life on, giving that service becomes disagreeable to the point where it seems that it's not worth doing. I can't remember the name for this or who came up with it.