Why buy and read your book when there are so many others on the shelves.
Buying a book is a contract between the writer and the reader. The reader expects to be entertained, to be informed. Your book is a proposal to the reader. You ask “Does this mean something to you? I find this interesting, and I hope that maybe you will too.” And often the answer is ‘No’ and if that happens, and they don’t buy your book, then maybe you are alone with your obsession.