Make an in-character dueling guild then. You see, there are two types of dueling. There is the OOC game-mechanic duel, and the friendly (or sometimes not-so-friendly) competition between two people to see who is more talented. If you make your guild about the latter and write up a history and background as such, you\'ll be fine. If you just say, \"Yea, come join my guild and duel,\" you won\'t be.
What\'s the difference? Well, the former is within a role-playing context while the latter is not. That\'s the thing you don\'t understand I think... You must role-play in the game all the time. As has been mentioned, this doesn\'t mean you have to sit around doing nothing. But when you do something in the game, it has to be in-character. If you can\'t cope with that, then please, make everyone\'s life (including your own) easier and find another game.