Seems just pondering it for a moment or two that trying to conclude that the "best racing" occurs at a track based on fan attendence is somewhat misguided. What track sells out every race every time twice a year? A one-mile track up in the Northeast for one, called New Hampshire International Speedway. Near as I can tell from reading and listening the general consensus is that racing there is pretty sucky.
Non "cookie-cutter" tracks that tend to have good racing, at least I think they do, like Rockingham and Darlington can't sell out a race to save their souls. Darlington did finally manage to get another sell out when fans suddenly woke up and realized that the Southern 500 (by any name) would no longer be run on Labor Day weekend. Rockingham fans couldn't even muster the gumption to sell the place out when everybody knows the second race is history.
California sells out regularly, as do Las Vegas, Chicago, Kansas probably so e others.
The point being what so many label as "boring" racetracks sell out as frequently or more frequently than those highly exciting tracks which are not "cookie cutters". The conclusion that fan attendence relates to the racing is not valid. May have something to do with it, may not.
Nor, IMO, is the conclusion that a "cookie cutter" is destined to provide poor racing. It doesn't work for other track designs, why would it work that way for 1.5 milers? Examples............Great racing at some one milers like Rockingham and Dover, not so great at say New Hamphire. All one mile tracks.
To go one step further, does anyone really believe that the racing at say Texas and Atlanta is like the racing at say Chicago and Kansas? Or the racing at Charlotte like the racing at Las Vegas or California? Is the racing at Indianapolis better or worse??? Certainly no cooke cutter that. How about Pocono?
Sometimes it is and sometimes it ain't good racing, using the term as best I can understad it, at any track of any size or configuration. Does the field tend to stay bunched up at place liek Bristol and Martinsville and Rochmond??? Yep. But you could accomplish the same thing anywhere by throwing a caution flag every 70 miles or so. Are bunches of wadded up cars, broken parts, and boiling tempers required for good racing?
Don't think its realistic, but I can only imagine...