How does the creation and collective study of a Guru's biography, like the Shri Sai Satcharita, help build a spiritual community?

The process of creating and studying a Guru's biography fosters a spiritual community centered on service. Chapter 0 describes how a Sadguru accepts service from the devotee who writes the biography. This service extends to the community when other devotees study and perform Parayans of the work. This shared activity unites people, as the writer gains the merit of public service and serving God in humanity, and the participating devotees also progress toward achieving their life's purpose, creating a collective spiritual endeavor.