I would say another area that causes videogames to not be able to fit the model that other media like DVDs and music (and PCs to some extent) is that they have been history been evolving from a technical standpoint to be able to do more, get better, look better and improve. With movies and music, the tech is pretty much set. They are generally good enough for most people. However, with videogames, we have had jumps. Graphics get better, and AI and so on demand more. The end result was the need to drive hardware to improve, and match the wishes of developers (you can see Nintendo's philosophy here).
Post-crash (early 1980s) you saw Nintendo lay down a business model that was viable. When Atari 2600 became the standard with all companies running 2600 games on their systems, there was a clear lack of quality control. caused the crash.
