^Indeed, that was my point... I think we're miscommunicating here :) Can't MS do exactly the same, and charge the user for the playback feature with a microtransaction that downloads the software/unlock key?
That's what they do on Windows: they give you the mediaplayer, but you have to buy the DVD playing/decrypting software separately, as well as other codecs.
Or of course, they can sell you a neXtbox "media edition" that includes a wide array of media-related software at a lower price than what you would pay when upgrading to each of them.