What if anything does your departments do if you have a member who has little or no participation? Volunteering is what we do but we have people who depend on us. When do they get put on inactive list or are taken off the department? Does any other departments have this problem? We have taken over 10 people off the department in the past year because of inactivity. These people are usually the ones who want to say "look at ME i am a firefighter" but when the tones drop they are no where to be found. Inactivity is not just during runs, but meetings, trainings, and special events.
If the people you are letting go aren't participating then they are already a manpower issue.
I'd rather have a slim roster of people who participate than a full roster because you are only going to be able to count on the same amount of people, and in the end keeping slackers on the roster does far more to hurt morale and participation than any amount of good.
We have participation SOPS where if you fall below a certain level you get a warning letter. For a calender year after that if you fall below the minimum standards a second time you get a termination letter. We will work with people who come to us with extenuating circumstances, but they have to take the initiative to come to us first.