What are the spiritual fruits obtained from writing the biography of an extraordinary jurist or great politician, as described in the preface?

According to the preface of the Shri Sai Satcharita, writing the biographies of worldly figures like extraordinary jurists or great politicians explicitly does not yield spiritual fruits. Chapter 0 makes a clear distinction between this 'worldly service' and the spiritually beneficial act of writing a saint's biography. While the author acknowledges that chronicling the lives of worldly Gurus is a form of public service and education, it is described as being limited by space and time, rooted in self-interest, and therefore, 'it does not yield spiritual fruits.'