How does the creation and study of a Guru's biography serve both the writer and the community of devotees?

Chapter 0 outlines a twofold benefit. For the writer, studying and composing a detailed poetic biography of their Guru is considered a form of direct Guru service. For the community, the benefits are also immense. When other devotees study and perform Parayans of the completed work, Chapter 0 states the writer is credited with the merit of public service and serving God within humanity (Jan-Janardan). Simultaneously, these other devotees, through their study and participation, are guided towards achieving the ultimate purpose of their lives. This creates a powerful spiritual ecosystem where the act of writing and reading becomes a collective service to the Sadguru.