You must have kids in Competitive Dance and are speaking from experience. My daughter was in Competitive Dance for several years. I never asked how much my wife was spending a year on it mainly because I didn’t want to know but it was thousands a year with the travel, costumes, and lesson costs. I am so glad to be done with all that. Traveling baseball was cheap compared to dance. For people complaining it is only for rich kids. All HS athletes benefit from rich parents, paying for better equipment, and year round camps. This is nothing new, and I wouldn’t expect anything different from bass leagues either.
For the kids I know involved in HS fishing, Their parents or other family member is providing most of if not all the equipment being used. I know of no one that a parent who went out and purchased any of the things you listed for the kid to use. You must not know anyone who has kids involved in Hockey or girls dance if you think HS fishing is expensive.