Richard Branson made his fortune because he's a shrewd business person, and also because he's been lucky at times. He's successful, however, because of his personality and attitude -- his personal philosophy -- and that's what this book is about. There is nothing earth shattering in his philosophy, except perhaps that it takes an extraordinary person to truly live up to it.
I don't think that Branson was looking to make money on the book, but rather to share some ideas that, for good reason, he truly believes in. He's not one to overcomplicate things, and in this case shorter is better. He keeps it simple because to him it is simple. As other reviewers have noted, it's a small book and it can be read in one sitting. It seems like it was dictated and indeed could benefit from some editing, but perhaps that's what makes the book real and is part of its charm. If you're looking for more then buy his book "Losing My Virginity" which contains some details about his various ventures. Otherwise, Screw It, it's a good read so just buy the book.
Steven K. Gold
Author, Entrepreneur's Notebook: Practical Advice for Starting a New Business Venture