Ha, reading "Mr. Forceman" caused me great amusement. Perhaps I shall patent a range of Mean Obscene Enzyme-Destroying Machines of my own...
I would still like to read an answer to my original question, but unfortunately this is not forthcoming. I do not think my comments are judgemental, as they are mere questions; I admit I become rather irritated after receiving a number of replies that make no attempt to answer my original question. Never mind, if I receive no real answer to my original question I may well email the man himself and hope that he at least dignifies my query with a response.
I do not feel I am suggesting anything out-of-the-ordinary here; I am merely asking why someone needs to charge $50 for a book he can display on his site for free.