You and a fair number of others I think, so my premis of is the Jr. Nation potentialy detrimental would be answered positively if the crowds decrease should this happen.
I only go to one race weekend a year, July in New Hampshire, It's a relative bargain, $150 for Busch and Cup tickets per person, $22 a night for camping Friday, Saturday, and Sunday nights, plus the obligatory T-Shirt and the occasional hat.
However, if you factor in set priced food and beverage for the time me and the wife are on the premisis, you could nearly double that cost.
Adding in that going to get a beer or coke or to take a leak will cause me to miss 10-15% of the race, assuming i go 4 times (honestly, i go to the cooler for beer more than 4 times, but at $8 bucks a pop for keg beer in a paper cup, i'd go alot less), I'll give up the great experience that is live racing for the best seat in the house, the living room grandstand.
The 3 short tracks here in Connecticut charge for beer, $5 for a 24 ounce draft, reasonable compared to most set price places, but you can bring in food and soda. It sucks, but the financial boost from beer sales is needed to keep them in business, and i don't mind it. However, that is a friday night out of the house, whereas race weekend is a financial hit from the get go.