So you're a guy or gal who likes to open water slalom and consider yourself pretty good. Has maybe even seen a water ski magazine in the past or watched a good skier on Youtube who you try to mimic. You see there is a tournament close by so you enter and give it a shot.
You get there and realize that while everyone is really friendly, they have all been doing this for 10-30 years and are neck deep in it. Even the lower end competitors are -22/-28 off skiers while you can barely run a pass at long line or -15 at your minimum speed. The people at -35 to -39 seem to be in another world.
So maybe you had fun and consider it as a sport. Let's see. Sell the IO and spend maybe $30-50K on a used tournament boat. Then to find a place to train, people to train with, get the proper equipment, devote X amount of years to it? I don't think it's attractive to the masses. Much more simple to buy a used set of golf clubs and play a muni course (or insert whatever low barrier to entry sport that you wish). I'm not saying that people don't make the jump into the sport in the same scenario that I set up, just that it's going to be a low number.