Just to add this, If you say had some land. You could make some kind of a barn and put a CQB field in it.
Unless airsoft in canada is like airsoft in japan you will only lose money.
But if you had some land and say $20,000(US) I can see some one makeing a indoor field. I don't know if you could make a liveing off of it but I think it could pay for it's self.