It is written by a dance parent, but easily applies to other sports and activities our children participate in. I think it helps sometimes when you actually do realize how much this sport costs, to see what you are actually paying for. Someone who is good with words and familiar with gymnastics should write one called "Why I don't pay for gymnastics anymore."
http://shadmartin.blogspot.com/2015/10/why-i-dont-pay-for-dance-anymore.html?m=1
http://shadmartin.blogspot.com/2015/10/why-i-dont-pay-for-dance-anymore.html?m=1