I like it! Although only people who have won Citadel matches can enter, right? Also, are the "best Citadel fighters" are determined by results IC or OOC?

If you need any help fleshing it out; a neat idea of an area the IC headquarters of an organization like this could be in could potentially be Scara Brae's The Zirnden. It is well known for fight rings, gambling and stuff. Just an idea though