The movie industry actually does this, more or less. It's not a monotonic function, which makes analysis of it mathematically messy, but it's common (albeit less common now than twenty years ago) for films to be screened for a while in cheaper second-run theaters after their first, full-priced run; and then they go to video-on-demand services and DVD, which are cheaper still.

Wouldn't surprise me if similar things happened with 3D projectors and other value-added bells and whistles, but I don't have any hard data.