You know it's hard to write a book you believe won't sell. Not that it's bad or unmarketable. I've written several books I was CERTAIN would sell and didn't.
A large part of why I feel this way has to do with my ego, but there's another important part in play too. My characters. Being rejected means their voices would never be heard. Their story never to be told. I love my characters, even the villians, and when they're not published, I feel sorry for them more than I do for myself. So that's a lot, folks. LOL!