If you sell the book the usual way, you are paid a percentage of sales; the publisher pays for web design, printing, etc out of the percentage they don't pay yo

If you sell the book the usual way, you are paid a percentage of sales; the publisher pays for web design, printing, etc out of the percentage they don't pay you, so in a very real sense, when you write a book, from your perspective, you are paying the web developer a percentage.