This certainly may not be the only factor, but I’ve noticed that younger fans tend to be plentiful at big events. Winged sprint cars and late models quite frankly do a better job of turning their races into big events than non-wing sprints. Something else I notice is that those two forms of dirt racing have the same “big names” year after year that help make those races seem like a big event. They don’t have many who pass through as a stepping stone to NASCAR or another form of racing, and that staying power helps them attract and keep young fans.