Heh. There are also many factors that affect writing output, and I'd venture to say the majority of those factors are not within the writer's control. So, for those lucky enough to devote themselves (almost) full time to the writing craft: Woohoo! For those of us who have enough time for only a sentence or two every so often: Woohoo! And for those of us who fall between these two extremes: Woohoo!

We're writers. We write at an individual pace, and we use individual methods. IMO, it's the dedication and the willingness to improve, regardless of what stage you're at in your writing career.