I've got an idea for a sequel to Misfits, and I can't wait to get started on it. But...I'm not sure if I should start writing it yet. What if Misfits doesn't sell? What if I get an agent for it and she/he wants me to take the next book in a different direction?
Anyway, I've got other books waiting for my attention. I don't like leaving projects half-finished when they're still "live" in my imagination. I've been planning to finish Adventures in Zoology for over a year; maybe I'll work on it next. And The Trickster Society really needs me to finish the rewrite.
Besides, until I can think up a working title for the Misfits sequel, I'm better off not starting it.