The main advantage of writing ebook compare to any other online business opportunity is that, you don’t need to create it over and over again. You can just do it at once and you will have continuous income. If somebody paid you for your ebook , you can still sell it to other people. As long as you make it available online for downloading, you will earn money from it even when you are sleeping. That means, the potential customers are unlimited. You can have as many customers as you want. You don’t need to create it over and over again. If you have come up with an ebook, you can guarantee an income streaming.