Now for the bottom line - cost. The wholesale price of just printing this single book was $70+ shipping! That doesn't include developing and creating my original artwork/graphics, design time, materials/tools or labor. If I were to charge someone $150 for it - they might think it was outrageous... but in this scenario, I would only be making roughly $13/hour with absolutely no compensation for overhead. That's not much better pay than working at McDonalds.
Moral of the story - there's much more than meets the eye to a photographer's job - so never underestimate the work and time dedicated towards delivering a professional product.