Interestingly, production companies don't own cameras. In fact, most production companies own little else other than their office furniture. Everything on the set is rented—right down to the clap-board and director's chair. With a major theatrical film, it may be two to three years from the first contract signed, to opening night. Only four to six weeks of that time may be spent in the actual filming. Even an industrial film may be in production for several months to a year, with only a few days of shooting.
There simply is no point in keeping a very expensive camera on the shelf until the next time, specially since the camera is chosen to match the needs of the production. One might be shooting with a wide-screen Panavision for one movie and a hand-held Arri for the next.
Panavision cameras are not for sale—they can only be rented. I was looking at the site of a movie supply company a few months back, and not only can you rent a RED, with whatever combination of equipment you need, but you can rent it with its own technician!
The main camera unit of a RED One is something like $25,000US, but by the time it is configured for movie-making, the package value may well be $50-60,000US or more. The camera is entirely—might I say extremely—modular, and you put together the combination you need. As well as a standard movie camera, it can be configured as a still camera or a 3D movie camera.
http://www.red.com/