Voluntarism (from Merriam-Websters’ Online Dictionary, http://www.m-w.com/dictionary/voluntarism+):
Main Entry: vol·un·ta·rism 
Pronunciation: 'vä-l&n-t&-"ri-z&m
Function: noun
1 : the principle or system of doing something by or relying on voluntary action or volunteers
Have you ever noticed that in many volunteer organizations (without paid staff like the Red Cross or the Scouting organizations have), much of the work is done by a handful of individuals? One thing that I’ve begun to notice about the individuals that do much of the work is that they tend to be the people who have the least amount of time available because they have other commitments as well.
I kind of wonder what the folks who aren’t volunteering are doing? Many of them seem to have small children. Funny, I don’t remember requiring that amount of attention when I was little! (I’ll bet I get a comment from Mom about that one!).