A couple- three weeks ago a friend of mine was telling me about something he read about spectators attending sporting events. He said that (as we all know) the NHRA and NASCAR spectator attendance are very low but also the sporting events like baseball were off too- but what was interesting was that monster truck events were very high in attendance -off the charts??
He also said the article was referring to the average age of the attendees of the events -NASCAR & NHRA have increased to an average 55 plus as well as the baseball attendees have done the same. It showed the average for the monster truck events were much lower say 25 - 35 average age??

I'm not sure about the exact numbers but I think you all get the idea.

Maybe the public is out growing some of these events and a new era of sporting attendees (younger) are out there attending these newer(different)events.