Any real sport or just the ones you know? For example, baseball is really popular in the US but most people where I'm from would have a hard time watching it if you tried to pay them to: we don't know the rules of the game very well, we understand the strategies the teams use, we can't tell an exciting play from a boring one, etc.

With video games its a bit similar. If you played the game or something similar before you can appreciate whats going on but otherwise you will be completely lost and everything feels pointless.