Interior Layout or formatting refers to the way your book will look on the inside. As always you want every part of it to look professional. Your reader will notice inconsistent, poor formatting and it will reflect on your abilities as an author. It will also affect the bottom line for current and future royalties—your fan base.
It can be disheartening to put your heart and soul into writing your book, work on it for innumerable hours, look at it proudly, and be ready to offer it to the public, only to find that there is still a major roadblock to overcome.