The only people who offer death duels usually have maxed out trained characters, most people can't afford that or have young characters that wouldn't be able to last in a duel. I have not sen two high level trained duelists go at it before, but I have seen a lot of trained duelists challenge untrained.
Sure, if they suck at RP. Duels in general go unanswered and you know why? Because a lot of people assume that only good sword fighters offer duels. Smarter players make use of that to their advantage by offering duels, knowing their is a 80% chance that the action will frighten off the other player.