I was actually elected a chairman of a local organisation (the lowest level) this spring and that is about as much as I have time for. The district chairman has to invest more time (organising events and kicking procrastinating collaborators' asses) and money (phone calls, probably also bribes); needless to say, he gets his money back through processes I am not actually willing to participate in. And probability to assume that function for myself would be negligible even if I tried; I wasn't even elected as a delegate for the regional conference.