Most GMs absolutely love running games. We love plotting story arcs, crafting cunning NPCs, and working through our extensive library of evil voices. We revel in luring heroes into clever traps, forcing them into moral quandaries, and rolling an absolute mountain of dice in a single turn.
We often pay the price for this enjoyment, however. For some reason, which has never quite been made clear to me, everybody seems to have agreed that the GM is responsible for running the game, preparing maps, organising miniatures, arranging the venue, setting up the schedule, buying snacks, making sure everyone has something to write with, making sure that everyone has something to roll with, buying the rulebooks, reading the rulebooks, teaching the players the rules, teaching the players the rules again, printing…
