Sorry, don't agree at all with the empty track idea.
Example: the NHRA's annual trek this week leads to the Joliet, IL dragstrip SWof Chicago. Me and my bro' plan to attend at least on Saturday as more cars run (Comp/Super Comp/SS/S etc.) than even on a Sunday. But, as in past years I'd be shocked to see this great track even 50% full, even on final eliminations on Sunday.
Why? A multitude of reasons ike the economy, ticket prcies. competing musical events, too many NHRA events, etc. But in the main IMHO it's the old school f*$#'ed in the head NHRA senior staff who misses the point. Young fellows want to see 4 cylinder Hondas, V-6 Nissans, Toyos and other current era cars run and except for seperate events, these imports are essentially banned for higher class, NHRA event races.
Don't believe me? See any USA based track that runs import-only events and you'd be shocked to see how many fans fill the stands. Ditto for Super Ford or Super Chevy events. NHRA has made a mess of things and nobody can tell me the sport of drag racing, at any level and at any event, is better off with fewer butts in the stands. Boggles the mind to think that for drag racing.... less is more. No way, Jose'!