An interesting idea. A few of things you would need to factor in is the cost of insurance each time it is shipped, and the cost of a very good case, a spare ground glass and one box of film to get started.
You could have everyone kick in for a box of film and if someone wants to use more sheets then their allotment, they could pay for extra sheets with the money going into a "kitty" for the next film purhcase.
If you are talking about 11x14 or bigger, you are looking at about $300-$500 for a decent case to hold a camera, 3 holders and a lens. For 8x10 useable cases show up on ebay pretty often.