That is if fans get behind their teams at all. Communities don't support schools like the Class A towns do. One of the wonderful things that I love about March Madness is how the towns turn out to support the teams. It isn't just once teams reach the Sweet 16 or Elite 8 does the support flow. Many a time the best advice I was given when covering a regional was to get there early.
Fire marshals tend to get strict about capacities.
Consider this from Carthage coach Eric Bryan after the Blueboys were knocked out in the in the Havana sectional semifinal by Bluffs, with a school population of 98. It was great to see our half of the gym filled an hour before the game. That's what Carthage is all about. Delete the Carthage from that quote and insert almost any Class A school and that could be any coach talking about the support from the community. You don't find that in New Jersey or Pennsylvania.