Adam Chapnick twittered about NeoFlix's DIYFlix blog posting about most popular pricing techniques for their clients. It ran counter to my instincts as I would have thought more gravitated to the high and low end, but by far the most popular price point is $15-$20. The DIYFlix blog itself has a pile of good advice & food for thought, so check it out.
Some of the best advice in this category comes from the example of HELVETICA. As Scott Kirsner points out in his indispensable right-of-the-moment guide to building an audience (Fans, Friends, & Followers) "Selling just one thing is old hat".
Multiple versions and merchandising is the way to go. So much more can be done with this. By all means there should be multiple versions of all films, with different additional content, commentary, even cuts. Why is that we only get the dvd with the film, and maybe a t-shirt or action figure? If fans want to show their appreciation for a work there should be something more substantial. One of my favorite pieces of film fetish paraphernalia is this: Brendan Dawes' Cinema Redux print of Kubrick's 2001 The film is reduced to one image from every second of the film in high resolution. Each row has sixty frames in it.
Why can't we have more beautiful works derived from the films we love?