When you write about your life, you create a legacy that lives on beyond your death and introduces you to generation after generation. You may make new sense of, or gain fresh awareness about, your past; remember the saying, "Those who do not understand the past are doomed to repeat it." Maybe you just enjoy reminiscing or have fun writing. And the published memoir is a genre readers are buying these days, so perhaps yours could be the next Roots or Angela's Ashes, making you millions.