I know a lot of writers who would much rather be writing the Great American Novel, but they've got bills to pay and alimony, and so they take a job at a less-than-reputable paper. You know, you do what you gotta do.
I've been pretty lucky - or slothful - in that I've never been a 'career builder.' I take the jobs that come along that feel right, and that's left me fairly open to all genres, really. But with 'Caprica,' the complex, dark and very smart script was the draw.