While I must admit I do not get the jist of Unknown_k's "reason" for demos, I will aver, for me, to sit and watch a fuckin' demo is ridiculous. I am an impatient, input kind of person. I could not give a rat's hairy ass about demos, whether they are on Apple ][GS, C 64, Amiga, Aatri St ,etc.
There are many people who love them, code them, collect them. That's fine. But they don't do a thing for me. I am speaking for myself and no one else here.
You can keep 'em.