well I know this past weekend we shared a field with another game..but the one I hosted wasnt a public event and it was planned Weeks in advance.
Generally I avoid scheduling public games that coincide with others, and if I have one planned and another person posts a game that may cause a conflict that would actually concern me about attendance then I would contact them and see what we can do to resolve it together as hosts (attendance issues with DragonOps last year for example).
However this year now that Dragon Ops is no longer a consideration, my concerns about attendance is minimal and revolves around people flaking out on games at the last minute. as Atreyu said, by renting the land off established Paintball fields we have a lower risk factor and no minimums to meet, worse case is if we cant get a group of 15-20 players we just cancel the game.
Be safe not just with yourself, but those you play with. If you are reckless with other peoples safety then you will leave.