I wrote a book on pricing software [1] that sells for $50+ per copy. Not only does it supply me with passive income, but it serves as instant credibility when

I wrote a book on pricing software [1] that sells for $50+ per copy. Not only does it supply me with passive income, but it serves as instant credibility when I introduce myself to people in the field. [1] http://taprun.com/pricing http://taprun.com/pricing