I think it's a lot like golf as well, and I think I can generalize a bit on this.
Sports that have competitors who typically show restraint and reserve typically are those which also expect silence from spectators. These sports are usually sports where a player isn't directly contesting the actions of an opponent; rather, opponents are both trying to do the same thing better than the other. Also, they usually are sports that involve some form of shot-making that requires an extreme level of precision, and that place much more emphasis on concentration and technique than on physical exertion.
Golf, darts, bowling and the various forms of pool occur to me. In all of these it is considered very much against fair play to attempt to use noise to distract a player in the middle of a shot. Darts spectators are a bit louder, but the principle is the same; you don't hear any spectators — let alone competitors — trying to throw a player off by shouting in the middle of a throw. If they did, they'd probably be thrown out.
Tennis is the only "quiet" sport I can think of that doesn't quite fit this model. I'm sure it requires enormous precision and concentration to hit a serve, but certainly no more than is required by a batter in cricket or baseball, and those crowds can get pretty loud.
I think the spectators are loudest in so-called "contact" sports, where players on opposing teams directly prevent each other from accomplishing an objective: the various forms of football, basketball, hockey and so on. All of these sports are characterized by having some form of "defense" as part of the game. And it seems to me that these are the sports where the players "go nuts" the most when they succeed at their game's objective.