the sustainability half or the how many teams half?
as to sustainability, by offering the gym/cafe and shop (which given our kind of area would stock more than just PB gear, therefore a bigger demographic)
Gym open to any health and fitness folks and the cafe providing food to suit the keep fit regimes aswell as offering the more "junky" type foods. and rather than just being a one field tournament arena, a internal woodland scene could be done aswell. all with ample public viewing which most parents miss when they take kids to play for birthdays.
ragrds teams and frequency, I know one or two teams in the UK that practice weekly or train together regularly (not just paintball though, there are other exercises etc that can be done to improve in the sport)
but hey i spend too much time thinking this through lol!!