To me, at least for professional gamers, they're really entertaining to watch. They understand the game they're playing completely and are dedicating themselves full time to be the best player.
It is something that I admire, plus it gives people that "live" for playing games a chance for a decent life and job.
Does it though? I feel I usually prefer to go to a github page of a project and will only resort to their website if the documentation only lives there. Maybe I'm in the minority :(