I did already try to explain this but as I work more on mine I realize I left a few pieces out. Consider this an update to that post.
My basic short answer is that a Book of Shadows is an autobiographical spiritual instructional manual. For me and many other spiritual people our whole lives are spiritual in nature (yes even washing the dishes can be) and for that reason Book of Shadows often have a lot of daily life items in them as well. For this reason No two books can ever be the same. We edit as we choose and so does everyone else. Even if a teacher teaches 100 people, and each student copies from the teaches book, each book will be different because each student will want to add other items that have meaning to them.
You can also purchase book of shadows from the published ones to very very expensive ones that are printed out and bound and beautiful. Or even made by another High Priestess or High Priest. However they will be empty and meaningless if they do not speak to you and if you do not add your touches and your energy to the book. On the same note if you choose to keep you book in say a 3 ring binder as many witches do, and you pour your heart and intention into it. it is no less or more then the other bound books. Because it is an instructional manual of you it needs to be how you want it to be.