I read an interview with a teacher who seemed very nice, but his advice to his students was that they should never think about the commercial potential of a novel, but only write because they have a good story to tell. Having a good story is essential, but not caring about making money from hundreds of hours of work? Seriously? I don’t know how other writers feel. Personally, I have no desire to be the George Seurat of novels. If you don’t think about the commercial potential of your book, you should remember that publishers do. If you don’t care whether anyone sees your work, you have a perfect venue. It’s called a diary, or, in my case, a blog.