Not necessarily. They may not take any responsibility for the youngsters, display and disclimer to that extent and most likely don't put themselves into one to one situations.
Not for profit (in the offical sense of a not for profit organisation) is a whole different ball game which I know very little about. It is a possibility and there certainly was (may still be) some generous pots of money around to help with set-up, equipment, websites and publicity, running costs etc. there is someone around this area running a similar enterprise under the guise of a not for profit organisation. Seems to manage to earn a fairly fat living out of "not for profit" but dont get me started!
If you struggle with the fire bit of your insurance try that Birnbeck company. My other half seems to be insured for everything under the sun bushcraft and environmental play based and seems to get it for a good premium.