I agree with some of the others. I used to be the kind of DM and player that preferred rules for every little thing, from haggling to sailing to riding a horse. I've long since abandoned that approach since it gets in the way of true roleplaying. You can't explore a story if you're busy rolling dice. Combat? Sure, that needs rules, and 4e looks like it provides good ones. The skill challenge system I like too, for more complicated situations, but most of the time, just leave us be to roleplay.