Lost in the deal tails,but key things are for sure well run show,
,promotor/letting the fans know to get them there, a good show* gets fans back and part of the show is not just racing,but did the fan have a all around good time,food,seating,clean rest room,good PA,good program. So locastion can also make or brake.
For me,I really do love short track=an that to me is 1/4 mile up to 1/3 mile.
As much as I like 1/2 mile,it's much harder to run 1/2 as a weekly show,takes more cost at every point,upkeep,lights, race cars takes more to look like a race an if crash happens on 1/2,mostly kills the car vs smaller track it can be fixed for next week.