I freelance, but I have to say if I had a staff job and had to quit freelancing I worry I'd get restless. The fun thing about freelancing is the constant hustle to get published in better and more prestigious magazines. Some people are well-suited to that restlessness and would, I think, get bored in a staff job.
unrelated to this post: where is Balk? Who is going to fill us in on the latest studies in Science Magazine?