I really like what your propose here. It is by far the most simple solution I have seen so far. Indeed, a user that is generous and not simply self-serving is one that people wish to interact with. The incentive works. I will go through the maths of the formulas later and try to understand the mechanics of your proposal. For now I shall leave saying this, you are doing exactly what you should be as a witness - finding problems and proposing solutions. Thank you, @ura-soul.