Could you explain why performing a 'Parayan' of a detailed Guru biography is considered a form of service?

Performing a Parayan, or a devotional reading, of a detailed poetic Guru biography is a multi-faceted form of service. Chapter 0 states that the author who creates the biography is performing Guru service. Concurrently, when other devotees study and perform Parayans of that same work, the writer earns the merit of serving God in humanity (Jan-Janardan) and performing public service. Furthermore, those devotees who engage in the study also progress toward achieving the purpose of their own lives, making it a spiritually beneficial practice for all involved.