Why does anyone watch anything they could be doing themselves? Why do people watch sports when they could just all be playing themselves? Why are you here reading about other people playing a game you could just be playing yourself? Really people just want to chill out and watch and not be actively engaged with the game by playing it. Just like you'll get sports players chilling out watching a game, instead of actively participating, sweating, exerting themselves, etc. Not really that hard to understand.