Customers are likely to expect books to cost $9.95, $19.95, or even $49.95. This doesn't leave you much money to market your books or generate sales, due to production costs. Your income goals will determine how much you earn. If your goal is to make a substantial income, then you would need to sell thousands or hundreds of books each month.

You would soon find that your operating costs and marketing expenses exceed your revenues. There's a better way. Your self-published books can be used to sell customers and generate additional sales. You can self publish book online through and make your self-published book selling. 

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These are examples of how self-published books can create a highly profitable business:

A well-known speaking and presentation skills coach builds a huge list of targeted, hungry prospects and a multi-million dollar business with a self-published book.

A speaker and coach in presentation skills, self-published her book. The book has been sold more than 14,000 copies and is currently in its second printing. It continues to be sold every month. Despite the fact that her book is seven years old, She still gets quotes from it. In fact, the book recently scored blurbs in Glamour and Self magazines without even trying.

The source for accurate celebrity contact information creates monthly, recurring revenue from his self-published book.

An author self-published his book and sold it for $55.00. This book that provides contact information for celebrities is useful for authors who want positive quotes from celebrities to put on their book covers, fans seeking autographs, and charities looking for celebrity endorsements.

Even though $55.00 for a book is a great price, he didn't stop there. He created a membership website with data that wouldn't fit into the finished book. He includes publicist information, additional phone numbers, and charities the celebrity already supports. It's a lot of useful information specifically for authors and charities.

He charges only $9.95 a month for membership and promotes this option throughout his book. So instead of selling a book and getting paid once, he has created monthly, recurring revenue from individuals who want constant access to more extensive and constantly updated information.