? The question asked by op was about booster clubs, and those are (usually but apparently not always) non-profit organizations (not businesses) and run entirely on a volunteer basis, have a board, etc. Legally they HAVE to be transparent.
I do not ask my kid's gym how they compensate their coaches, pay for equipment, pay the rent, or anything else. I have no idea how profitable or non-profitable the gym is. You are right, I am not entitled to that information. I pay them a tuition and they train my kid. THAT is a clear business relationship and at our gym, it is very cut and dried and I like it that way. But I do expect the non-profit booster club that raises funds for meets and that I volunteer for and donate to, to be transparent about what is raised and how funds are spent! And I am pretty sure the IRS requires this is well. So it is not that I "believe" I am entitled to transparency- in that case,- I am entitled.
It sounds like some parents find that some gyms perhaps charge "meet fees" in amounts that strain credulity. If this is so, wouldn't that be a problem? I mean, of course they can charge what they want for tuition, but if they are calling a charge meet fees, then shouldn't the amount resemble actual costs of competing at meets?