Just an idea I had, why doesn't Glen Helen get some old 250F's and some old or new donated riding gear and use them as a payment for flagging duties payment? Notch up a certain number of volunteer flagging hours and you earn an hour or whatever on one of the bikes. The last hour of the day is devoted to the flaggers and other beginners only.
I know before I got my first dirtbike I would have been happy to spend a weekend to get an hour. And these kids would be more enthusiastic at the job then someone who can ride the track already with their own bike.
Just a thought. Hash it out and flame away.