Matt Wallace wrote a great piece on the "Rabbit Holes" of writing. I am currently down the first hole. I'm very busily trying to finish something that I feel is worthy of publishing, experimenting with genres, and trying to deserve the title of "author" which I find so satisfying and guilt inducing to apply to myself.
I will continue writing because I love it even when it tortures me and cries out from neglect. Whether it remains a hobby/obsession/passion or becomes a business and way of life, I won't give it up, and don't think I could.
Next on the table for edification is Angela Quarles on how indie authors can (legally) get their books into bookstores.