I Don't Write For Money, I Write For Love:
"So, you have to ask, what is the difference between a professional writer and an amateur? The difference is that a professional writes for money, of course, and demands a proper rate of pay. This is reasonable enough you might say, and it's certainly true that I could do with being paid for some of the things I write. But the real truth is that most of these professional writers not writing for themselves. They write for an editor who works for a proprietor whose main purpose is to fill his paper with advertising. So in the end, most writers are writing for advertisers."