Dice? You need dice for this game?

But in all seriousness, I've DM'ed a few times and I usually go with what I roll, even if I'm rolling treasure before the session starts. Occasionally, as in that one time the first kobold the group encounter rolled three twenties and killed the fighter, I'll fudge it just because it makes the game go smoother. Though I'd like to note that I enjoy rolling the dice even when there's no reason too, keep the PC's guessing and all that.