Not a statistic submitted to be included in my analysis, but many years ago I was tutoring a class on trumpet in a Boy's Club (Now coed) without receiving any pay or other benefit. I'd like to believe that such as 1 were multiplied at least a million times in each of the 50 U.S. States. I do know that many teachers put in many more hours than those in the classroom for which no pay or benefit is forthcoming. Perhaps the crux of this issue lay in liability for instruments, teachers, and students where there isn't adequate budget to pay the insurance premiums. I have observed that many community park playground equipment has now been removed due to unavailable funding for liability insurance and/or compliance with the latest safety regulations, ordinances, or law. Too, as a Boy Scout, I was tutoring other Scouts for their merit badge in Bugling (Then I already had mine) and recieved nothing then either.