//one must do these answers because people ask for help //
No Peter Pedant. A potential replier must first make a decision on whether he or she wants to answer. There is no MUST about it as none of us are compelled to answer.
Indeed, people do ask for help, but let's be honest and concede at least that an OP should have the courtesy to reply and acknowledge the reply in some way.
I don't desire or expect feedback regarding my replies as I am not out to see my replies classified as "Best Answer" or whatever. The sole exception for me is when I am mistaken over an answer I've provided as should be the case for all of us. Therefore, I shall not wait a very long time for something that I don't expect.