Gentlemen,
Barry makes a good point here, if it was my work being sold, you can bet it would never go for the $14.95 cost he allows it to be purchased at, the soft back book would Start at $50.00 and IMO he should put out a Collectors addition Hard Back Book for $65.00 unsigned, $80.00 signed addition, to make more money for himself. If this engineering knowledge was mine to sell, it would start at $25.00 for the ebook alone, Barry also allows us to make work copies of his technical engineering work at no cost, after purchasing his soft back book. This in itself is hardly ever permitted, in the technical direction/engineering world.
His Cost is exceptionally low in reality!