"Why do people watch youtubers play video games when they can just play the game themself?"

1. They can't afford the game or game system, but still wanna experience the game somehow
2. They're not good at the game because it's hard, scary, complicated, etc., but they wanna see what happens further in the game
3. They can't play video games for whatever reason (financial, physical, etc.), but still wanna see what the game is about
4. They like the person playing the game and like watching them
5. Fuck you, that's why.

(Add more if you like)