most people don't want to download everything they watch; they want to watch it once and that's it. same reason most people don't buy loads of dvds all the time. how many times are you going to watch walking dead season 3 episode 4? sure, you might want an offline copy of this or that movie, breaking bad etc. but most of the time a stream saves you the hassle of storing it, getting it via a torrent (which makes you an uploader) etc.