There are several ways to get paid for a book you have written. Some are easy, some are hard. Some make you a lot of money, some only a little. There is however only 1 easy way to make a lot of money by doing nothing after you have completed writing a book. That method is online distribution.
Online Distribution is the best method of distributing your book as after your initial investment it will cost you no more money to keep running (except monthly hosting fees), take you no time to maintain as everything can be fully automated (so your webstore does the day to day selling of your book for you) and literally allows you to make money while you sleep, WITHOUT DOING ANYTHING!
A good webstore will not only have a template to match the look and feel of your book, content to keep your customers happy and good SEO (search engine optimisation) to allow people to find it but it will also have a content manager (allowing you to update your webstore yourself 24/7), a shopping cart (to fully automate the shopping process for you from browsing through to checkout) and an email marketing system (for you to notify potential buyers of any changes to your store).
The average webstore can be setup in less than 3 months and while it may not make you a millionaire overnight the average book when marketed correctly can supplement the average income. Imagine if you had more than 1 book or your book available in more than 1 format. It would cost you no more money, you could add your new product yourself with a few button clicks and it would never cost you any more money but only increase your return on investment with each additional product you decide to sell.
For more information on online distribution, check out 'How to Make Money while You Sleep by Becoming a Published Author in Less than 3 Months' THE SEMINAR or 'How to Make Money while You Sleep by Becoming a Published Author in Less than 3 Months' THE BOOK.