There should be an arena like the Thorn, but I could set the rules. Like which enemy to fight, human or creature. What weapons they use, and how may I am to fight/ or are to fight others. Then place bets. Or I coulc watch a fight I set up as well. They should make it a square arena with random cover. The roof should be bullet proof glass so I can stand on it and look down, instead of falling in and getting shot. The people who own it are independent so they could capture any human. Slaves,NCR, Legion, Brotherhood, etc.. I was dissapointed when there wasn't and undergorund fight club. It would be nice to fight stuff seeing since there is a lack of stuff to fight in the wasteland. Well, at least without fast traveling to all of their homes. Not to metnion it doesn't make factions hostile since it's underground. Just a thought.