I understand what you are saying but just do not agree. If the rule was adopted to encourage participation, I would ask - participation in what? Riding? Riding enduros? Riding TSCEC Enduros?
My point would be, it does encourage riding and helps the parents with cost of participation (in TSCEC Enduros). It encourages participation by being one of the few racing formats that a parent can ride on the same row and enjoy the same race at the same time during the actual TSCEC enduro. I can not do this in other racing formats.
So again, regardless of class, this does help the parent and encourages the parent/son (or daughter) to go to and participate in Enduro's vs. another racing format.
The only issues that we may not agree (as I see it) is - Should the skill level of the kid determine how much is paid? My answer is no. A kid riding a motorcycle is a kid regardless if he racing 16 and under small wheel or against the AA's.
I woudl say let the kids ride in what ever class, enter with $15.00 and if/when they are hooked at age 17, then you will have a racer for life. TSCEC and Enduros win in the long run (as well as a happy parent).
My only suggestion would then be when I hit 65 will we start a senior discount??

(just kidding)
Sam