“You can always count on the cheap seats.”—Harry Chapin
Seats were cheaper at the wooden stadium over in Fidenae.
http://en.wikipedia.org/wiki/Fidenae
Stadium disaster
In 27 AD, an apparently cheaply built wooden amphitheatre, constructed by an entrepreneur named Atilius, collapsed in Fidenae resulting in by far the worst stadium disaster in history with as many as 20,000 dead and wounded out of the total audience of 50,000.[5][6]