The title of the thread should speak volumes. Btw, rugby is harder than American football. 
All respect to you but for you to say that billiard tables are in "pristine controlled environments" you have never experienced playing in Puerto Vallarta,Mx or most of the other cities in Mexico where there are no windows,no ac, 90 degrees, on a mild day with 95% humidity (sometimes you can see the condensation coming off of a rolling ball, wet chalk, crooked house cues,some with no tips. a mud cue ball ( if you happen to draw the ball more than a foot you are considered a pool god and are closely watched) not to mention the mostly Dynamo tables that were worn out 30 years ago with a 30 watt bare light bulb hanging somewhere on a wall 20 ft away or you have never played in any of the bars in Houston,tx with dirt floors & tables that are pushed out of the way to make room for a dance floor when the band shows up !Golf courses have elemental variables. Billiard tables are pristine controlled environments. That alone is worth talking about.
I've run 7(9ball) 3 times, just had a 5'9 blonde with a perfect body walk up next to me in a NICE restaurant in Scottsdale, no idea where I was going with thisAnother consideration "playing pool" is easy, actually learning how to play pool well at the upper levels is a long and difficult undertaking (my experience). I would argue that mastering pool is impossible. Most guys that have ever ran 7-8 straight, strung 50 balls playing 14.1 etc. remember each time that has happened. (I know many very good players that may have never strung 8 or ran 50. Ralph Greenleaf, Willie Hoppe and a few others may have played 100 or better to score but that is an amazing and very difficult thing to pull off. Playing pool is easy, understanding the whole game and the intricacies is much more challenging and none of us know what we don't know. Golf I think is the same on a bigger less predictable playing surface.
Its too bad you only missed Danny D and playing him for cash at 9 ball by a few years. What a clownWhen I was young, I watched Ray Martin and Dan Deliberto playing 14.1 in the Golden 8 Ball on several occasions they played 50 or better to score and either of them could and did string 50 to 100 balls fairly often, most would agree both were very good players. I'm sure they were good, but I wonder how their 9-ball game was compared to Buddy Hall, Archer and others. I mentioned Warren earlier he wins the US Open in 9 Ball and I'm pretty sure his strongest game was 1 Pocket. Billy Weir played as good as any but gambled on another level, you would think he was a bookie or something. Rod Curry played strong but could be out gambled. I don't think I was ever as good a pool player as Rod, but I have left with decent sums of his money before.