Occasionally I hear D&D described as "like writing a novel." Or GMing as something that GMs do because they can't hack it at other creative pursuits. The Chatty DM occasionally refers to himself as a "failed novelist"--mostly as a joke, I think, but it serves to illustrate the point.
I really don't think this is accurate. There are better analogies than novel writing--directing a movie, for one. (Not my idea. I just stole it.) But the larger point:
I don't GM because I can't write novels. I GM because I love to run games. Because there are some things I can do with a roleplaying campaign that I can't do with a novel, or that are easier in roleplaying, or that are more fun in roleplaying.
And when I want to write a novel, I write a novel. Some ideas, some techniques, are fundamentally novelistic. But I don't think of writing a novel--or any other creative pursuit--as fundamentally superior to roleplaying.