Our MG group has been around for 20 + years. Probably 100 + members don't even garden anymore. Just put in their hours to remain a MG. We have a close relationship with the local University where we use their greenhouses and hold our annual plant sale with the biology/botany society - we gave them nearly 4,000 $ this year.
I am also a Master Naturalist - we have ~ 100 members (5 years old) and about 30 attend those meetings as well.