Just because it doesn't involve intense physical activity doesn't mean it's not a sport. Bowling is also a sport.
Even football is a game. You can play games in a sport or in a non-sport. Bowling uses a ball. If it uses a ball it's a sport. Some sports use another object rather than a ball, ie, hockey in which the token to be advanced is a puck. Makes more sense for a game that is played on ice to have something that slides rather than rolls. Badminton is a sport. It uses a shuttlecock in place of a tennis like ball to create the fluttering effect that is part of the game. Let me further elucidate to you why darts is a sport. It involves throwing an object with extreme accuracy, the more accurate the better the player, much like shooting, which is also a sport. A better analogy would be to compare the scoring of darts with the scoring of archery, which is also a sport that can be played by out of shape drunks. Throwing to a target or shooting an arrow is a measurable act, You and anybody watching knows instantly whether you or you opponent has done better without having to await the decision of some judge.
Your philosophy on all the above is really beginning to circle the bowl. But I'll add that I am significantly better at throwing darts when I am drunk than when I am sober. So there's a talent gap analysis that gives more credibility towards it being a game rather than a sport.
Just because you don't invest time to learn judged sports doesn't make them less of a sport. It just makes you less worldly. Your argument about "you or anyone watching knows who's done better" doesn't work. Plenty of football games have one team win that literally got out played. You aren't making any good logical points that dispute what is a sport and what is not.
Me and my friend used to see who could pee the farthest. There ways always a clear winner to our observing friends. Guess it's a sport.
Nothing like Gay Fridays and monkey fuckers, but I won't get into that. Something about large amounts of gayness when you group men together. Weird. Also, I was in when Obama removed it. Oddly enough, we all had to stop doing our "gay games".