Why do people write autobiographies?

People write autobiographies for many reasons.  One main reason people write about their life is because they think they had an experience or multiple experiences that could help, inspire, or teach people.  Some authors feel their life is important and others should know about it. Many authors write for their future kids, grand kids, and so on, so they can read and learn about their ancestor. Lastly, I think some people write just for the money! You can easily write about your life, even if its nothing special, and make money off selling your book.