Funny I stumbled across this thread.
My 11 y.o. and I have been flat tracking a lot this year since we now have a local track. I've thrown it down more in the past 6 months than I have in the past 4-5 years road racing.
After my last one in December I had to load the trailer and drive home with 1 arm because of my shoulder.
On the way home my son said "Dad, maybe we should take a break from dirt and stick to asphalt"...