Fantasy Book Critic posted a great interview with author Kate Elliott earlier this week.  As with most of their interviews, it's detailed and engaging, with enthusiastic answers from the author.  But most interesting about this interview in particular is what Ms. Elliott has to say about writing as a career and producing work in a reliably timely fashion:

Q: One of the things that most impresses me about you as a writer, is your ability to produce novels at a regular, almost yearly rate. What's your secret?

Kate: Desperation.

On a material level, in terms of earning a living, a person might write and produce because s/he needs the money. I am currently able to write full-time, but I also have a spouse whose work provides lower-cost health insurance for our family. Obviously if I had to work another job and write, I would not be able to write as much.

On a career level, perhaps one is driven to produce regularly in order to maintain the momentum of a building career, or at least not to lose too much momentum. Big gaps between books can hurt shelf life, can cause an author to fall out of the public eye, can hurt sales. In some cases, a big gap between books might throw the much awaited novel of a writer into high relief (e.g. George R. R. Martin's forthcoming fantasy), but it's just as likely to set back a writer's career.

When my children were little--and given that I was home all the time with them--I often wrote in order to get mental space for myself, in my own world where others did not, for five minutes or an hour or two, intrude. Writing at that time was a form of sanity.

In the larger sense, I have difficulty conceiving of existing without writing, so in that sense I write and continue to write because it's like breathing. It's not that I'm desperate to breathe; it's that I have to in order to be alive.

Also, I am aware that we cannot predict what will happen tomorrow: my career or my life could be over next week (although obviously I hope not!), or I could (as I devoutly hope) be churning along still writing and publishing in my 90s like the late Jack Williamson. I have a lot of stories I want to tell, and boy will they be pissed if they don't get their chance to be told. That's desperation.

Elliott is touching on a much larger question here -- the problem of being prolific.  Perhaps more than any other genre, fantasy authors differ greatly in their comparative quantities of work product.  Some authors produce more than two books a year; others take three years to publish a single volume.  Is this difference entirely coincidental and based on personal ability and talent, or is there a ratio between quantity and quality?  Presuming a certain base level of professional ability and talent, can we presume that those authors that publish less frequently generally produce deeper, better works? 

It's interesting that Elliott describes the huge gap between George Martin's last book and his as-yet-unpublished sequel as having a positive marketing effect, given that Martin himself has written at length about what a struggle it has been to complete his forthcoming novel, A Dance With Dragons.