It costs a lot of money to make a print book and if the market is small, few publishing companies are going to bother with the risk and the expense. Ebooks cost little more than the time it takes to write them. And anyone can write an ebook! You don’t have to be John Grisham or the world’s leading expert to write a book. Everyone knows something that other people don’t know, whether it’s how to fix a TV or how to tell the difference between a Fish Crow and a Northwestern Crow. You don’t even need to write it yourself. If you’ve got an idea for a book, simply find yourself a ghostwriter, tell them what’s on your mind and get them to write it for you.