1) A book is an asset, and provides long term revenue (even though it diminishes over time without some form of marketing / outreach) 2) A book establishes a c

1) A book is an asset, and provides long term revenue (even though it diminishes over time without some form of marketing / outreach) 2) A book establishes a customer base, and Pete can provide future offerings to this pool. 3) A book is a great way to establish credibility in a space. When someone is looking to hire a consultant to work out Rails <> Stripe, who looks more attractive: the guy who wrote the book on it, or "generic Rails developer"? The focus is on long term asset building, not short term gain.