Thanks for the helpI'll help you out. Markers are not the biggest outlay of money for a site, paint is and by a long way. If paint was alot cheaper, the money saved would easily offset the cost of buying 100 new guns.
Saying that though, I used to work for a site who thought that they would stick with Co2 because upgrading to Air would cost too much, I know its not really the same kind of figures but its still along the same kind of line.
I suppose it offers a new view. Say sites use 50 cal for punters, making that extra money OR reducing the cost for the customers and thus making paintball more affordable in the eyes of the general public.