I am a professional filmmaker taking some time off to be with family. So while my son is at school, let's play some D&D!
I find getting a game going is (usually) easier than getting a film made so being a Dungeon Master is great way to build worlds, create characters and then actually see it all come to life. I love to home-brew my games and I get such a thrill from presenting a moment or character to the players and watching them react and then start building on the story I started. RPGs are also the only medium I know where the audience and the collaborators are one and the same.