Yeah and unlike a ring it was fence surrounding it, not rope.
Also it has a door on it so you can enter or leave, how handy is that if you've got a bad back?
And unlike a ring, you could probably use it store chickens or other livestock when its not in use.
Yeah and in a ring how would Showtime pull off the The Showtime kick that won him the WEC title? How would Aldo pull off the superman punch push off?
If it was a ring, then something like this wouldn't be possible.