The big publishers have changed a lot in recent years so they now only publish books, they are certain to have bestsellers potential. That is, books they expect can sell in at least 3000-5000+ copies. A few years ago, it was enough that they had an expectation of a sale of at least 300 books – which typically suited what they sold to the country libraries. But in many places, libraries have joined together and the books have given way to meeting rooms and public services. This means that there is less space for the more special releases. For books that hit a narrow niche. But it’s not the same as the need for these books! Or that you can not make money on them! Because you easily can.