What keeps one going is the competitive nature of it. Beating your opponent completely in front of everyone is extremely gratifying, and the feeling you get when you know you can still greatly improve is a big part of it.
It's also just an inherently social event. Chess, Poker, Dominoes are really just you interacting with new people and their unique style of play and just talking with them like human beings. To call a board game like chess repetitive is like saying basic conversations with your fellow man are boring. They're not, every new opponent is different.
You just can't compare board game players to some loser video game speedrunner that plays the same level; 13,000 in a row in some dark room without getting bored or burnt out ever.
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