Independent VS Mainstream Film
The only numbers collected for going to see a film are 16-24 year olds and the cinema only really makes money from Popcorn and drinks.
Distributors get your film in the cinema. Its really hard to get an independent film in a cinema because the cinema knows less people will go in to see it which means less money spent on popcorn, so sometimes the distributors have to pay the cinema to get it shown. It works the other way with Mainstream films, and the cinema will be making most of there money from popcorn once again.