I think one of the main reasons is that pool is a notoriously singular and fairly selfish game. Think about it like this: At the highest level, the goal is to never let your opponent get to the table unless you have to. This means that the ideal match for any player would be one where the opponent never gets to the table AT ALL; you run out the entire set. So basically, if I come up to you and say "Hey! Let’s go play pool together!" I am REALLY saying "Hey! Let's go play pool together, but I don't want you to actually play...what I really want is for you to watch me run out all day long." I think that the people who are attracted to this kind of game need to have a certain type of brain in order to be willing to deliver (or endure) the kind of match where one player never gets to participate. A game where the ultimate goal is to be the only person playing is bound to attract the type of person who is willing to throw cues and cause tantrums. I also believe this is one of the many barriers to entry for new players; the threat of not being able to participate through no fault of their own besides a bad lag or coin flip.
I have been struggling to think of another game where it is possible that one player simply won't get to participate. Obviously this assumes we are playing winner breaks, which most people do. Can anyone think of another game that is like this?
Hum… my first thought, is politics, you might not think of it as a sport; If play well like todays current game, second place pays about as good to just watch.
So, my 2nd thought, you may be right,
However, if scores where to be settled, there is 4Ball.
I just couldn't resist.