If you only get 1000 players (about half as many as you want) you're still talking of around 70 refs on the basis of 1:15. If there were a large proportion of regular players then those numbers would be able to be reduced, but at rental prices for paint you won't get many walk on/tournament players. Even with 1:30, with your aim for 2k players that's still nearly 70 refs. Then again, that could explain the paint price - paying all those staff wages!
Sorry if I seem to be trying to put a damper on things, but safety is paramount in my mind and it only takes 1 person to lose an eye for an outcry against the sport and the resulting knee-jerk legislation put through Parliament spoiling it for all of us.