Why is the act of writing and reading a Guru's biography considered a form of meritorious service?

As explained in Chapter 0, writing and studying a detailed poetic Guru biography is a profound form of service with dual benefits. For the writer, the act of composing the biography is a direct form of Guru service. Simultaneously, when other devotees study and perform Parayans of that same work, the writer gains the additional merit of serving God in humanity, referred to as 'Jan-Janardan,' and performing a public service. For the readers, this engagement with the saint's life helps them achieve the purpose of their own lives, making the entire process a spiritually rewarding endeavor for all involved.