I am certainly guilty of not reporting back on results of the advice that I've gotten. I never really thought about anyone giving a hoot since the advisor usually seemed quite knowledgeable and already knew what would happen. I didn't see any point in telling them what they already knew. I will have to amend my ways.
I try to contribute to the forum by describing some technique or gizmo that I have just dawned upon that I think others might find useful.