What's the real value in writing or reading a book about a Guru? Isn't direct physical service more important?

The provided text elevates the act of studying a Guru's biography to a very high form of service. Chapter 0 describes the study and recitation of these texts as the 'highest, incomparable, and salvation-granting Guru service' for a devotee. It further clarifies that by writing a detailed poetic Guru biography, the author performs Guru service and also gains the merit of serving humanity (Jan-Janardan) when other devotees study it. This suggests that service through books is considered a profound and impactful form of devotion.