i once watched a guide on how to change the screen on my phone. i remember thinking i'd actually pay for that. but that was it. it was about 5 years ago. every other video i could happily live without.
what makes youtube so ubuquitous is that it's a kind of pastebin for videos. you don't need to care about storage cost even if only 2 people view your video in a year and you don't need to care about bandwidth if 10000 people decide to watch your video at the same time. youtube is just there and ready for any kind of load.