But at the same time it's true that some vital public activities aren't rewarded by the system atm. Eg. quality journalism, family rearing, open source, etc. Often that's an issue of privatized costs and socialized rewards. Finding a way to correct for this is a really big deal.
But aren't you now feeding back to the system? Why would there need to be a financial reward and incentive for everything?
I do realize "contributing free value" is perceived by some as free value a third party can capture and financially profit from" which might the reason for thinking of how to then cycle some of that value back?
Tabloid press is fantastically profitable, but fake news over time will erode a great deal of social trust.
Closed source software might be individually advantageous but collectively holds back industrial progress. It's a similar reason to why patents were first introduced for physical goods.
And yes people voluntarily without kids should have to pay significantly more social contributions.