What moves your pen?

To those that consider themselves writers or wannabees: Have you ever wondered why you strive to write and if the writing itself is satisfying why must you publish and make a real splash? Perhaps you have also felt a bit corrupt by your own possible motives as a writer?
Well, read on: Is Self-Loathing a Requirement for Writers?
This article lists reasons for why we write and what drives our desire to publish. I find that I suffer from Muse-overwhelm, self-loathing, self-awareness, creativity and just plain curiosity.