@tjs1295 you are probably more in touch with the real world than most of us due to your work, and you don't need to discount that at all. My partner works with youth in an area with many low-income immigrant families, so I am aware that I and many of us are in a bubble. In fact, my younger years growing up was in a low-income, immigrant family, and I am aware that my life now is quite a lot different.
Waterskiing does require discretionary income, and I don't think that it is inexpensive. The point I was trying to get across is that if you are able to join the sport without owning a boat, requiring private water access, or constantly updating gear, the hobby isn't as expensive as it's often made out to be here on these forums. I often see cost as the explainer for why more people don't join this sport. But I think that at a basic level, if you have a small but limited amount of discretionary income, you can get into this hobby without a large upkeep cost, provided that you can access a boat and don't need the newest gear. You can get into this hobby for less than the cost of a car hobbyist buying a $500 beater and trying to keep it running.
I know that if I needed to own a boat in order to waterski, this wouldn't be a financially viable hobby for me for the near future. But I am also lucky to live in a metropolitan area where boat access isn't too difficult due to clubs and the right networking. You make a good point that depending on where you live, not everyone has access to ski clubs. But I think that ties into one of the points I have been trying to make. If you have discretionary income and are able to access a ski club or waterski community (which is not always easy as you point out, and I think more difficult for the diverse demographics brought up in the original post), cost isn't the key limiting factor.