Silver Crown cars are a niche of a niche sport. There is a group of people that still love them, but that group is dwindling year over year. You can take a causal fan to a USAC midget, USAC sprint or WoO sprint car race and the action is going to draw them into the sport. You take a casual fan to a Silver Crown race and try to explain the nuances of the race, tire wear, gas milage, etc, and you are going to lose most people.