By CPP, do you mean concessions sales per patron? FYI, most theatre operators I know call it the per cap not the cpp.
As an arthouse, our per cap is lower than our mainstream counterparts because our audience is different...no kids, no teenages, lots of seniors. So, small is our most popular size. Our per cap was hovering at about $1.65 but we just raised some key prices and it's jumped about 20 to 25 cents.