I was watching Blue Harvest, the Family Guy Star Wars special today. I had the DVD and watched one of the special features, Seth MacFarlane interviewed George Lucas.
I can't recall exactly what Lucas said, but it was something along the lines of "I just think of a movie I'd like to watch, and I say 'Well, nobody's made that movie, so... I'll make it'.".
We, as roleplaying / story gamers and game designers, are really lucky. We get to make the books, comics, movies, and television shows we want to read or watch. And we get to do it with our friends. There's nothing quite like the games we play, and I think we should really appreciate them.