That would be a great idea if you can lose and gain weapons/spells/or whatever else you stick in the game, so after you kill someone, or beat them, you can choose what you want to take from them (like how much money, so you can leave a little if you're merciful), then the person who lost would leave the arena, with whatever you didn't take from them, and maybe his body would stay there awhile, so other people could take stuff from it.

sorry, I'm new to this, this should be at the bottom of thing about the arena idea.