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OP,
I would say the reason you don't see many of us is due to work schedules and time management. The schooling part is pretty obvious as well as everything else one has to keep up with to practice a specialty. The flip side is that to stay in stroke unless you are/were a prodigy at some point with great mechanics requires a LOT of time.
Another thing to consider is the 'Pool" environment. If one grew up playing pool and had a love for the game before school, that really doesn't play a factor. However, most of the other medical professionals I know don't come from that kind of background.......... I was 12 when I started playing pool in the Boys Clubs. I worked as a mechanic/automotive tech thru high school and a few years after until I was able to go to college.
I played my best pool when I was 19-22, and after school it took a good three years to get near where I was at that age playing at least 5 days a week!! (roughly 12 year break) Now I play 3 days a week and have been playing again for about a year after 3-4 years off. Time is the key, Doc