I do not see $10 per car for proxy racers as being a big expense, given what I believe happens behind the scenes.
Trips to the PO, un-boxing, Tech-In, race management, video equipment/feed, re-boxing, more trips to the PO, building fees, utilities, taxes, support equipment (computers, video editing s/w), track maintenance, etc.
Yeah, I can swing $10 to support my addiction. I pay more to see a 2hr movie in the the with the family.
I save money and do a bulk buying of supplies when John offers discounts several times a year.