I always liked this idea of a "ruleless, diceless RPG". I was always too lazy to read the RPG manuals, I didn't necessarily like the Tolkien universe, and I never liked randomness in battle outcomes. So the only way you could get me to be the gamemaster was to just let me create my own universe and let me decide on the outcome without resorting to dice. Usually plain common sense is enough: if you decide to attack a fully armed soldier barehanded, well you just die.