It is not about selling books, it is about communicating ideas and it doesn’t matter with which medium it will be done. Also, businesses can live longer than that. People construct houses that stand longer than 80 years. They start out with the idea of one day either selling the house or leaving it to their children. The customer of an entrepreneur is not the end consumer, but a possible future investor who will take over at some point. Myself, I’m not the company; I’m just the entrepreneur. While I still work “in” the company, I plan to remove myself bit by bit over the years. It is entrepreneurship. An entrepreneur builds businesses.