and you are a reasourceful human being with an obvious knowledge of how to operate a computer. So I'm sure that you could at least just grab a camera and take a picture yourself; or even figure out how to set up a VCR or capture device if you put your mind to it. Why must the company be responcible for all aspects that You want and are fully capable of fabricating for yourself?
Because like I said, there is a big difference between a screenshot or video of the action, and a demo recorder. A demo recorder doesn't output a video file, it outputs a file detailing the positions of everything around the player, which is then rendered by the engine, allowing for manipulation of the camera in much more sophisticated ways.
http://www.youtube.com/watch?v=Drp9o4E7G7U