It all goes to HP. Questions is just to get your doubts clarified and not for the sake of earning. As you very well know - people already spam the question option with insane questions just to get noticed and get an accolade as well as new followers.
If revenue is shared then even more useless questions will pop up which will hinder us from even bothering to answer because out of 100 questions only 1 may be a true question
Hope you got my pt.