I think charging $100 only works if one thinks that the ones who don't own the books might stump up. I find it hard to believe that enough guys that paid for the books are going to be concerned enough about additional work to courses to justify the cost of getting access to a line or two blurb when this kind of info is readily available online. The concept needs to be built into a larger marketing strategy. For instance, if Tom thought a course on hard times he really wants to help out could use additional funding, he could use a website fee as type of charity to help fund this concept. Folks may be more willing to give for the cause of "golf" than to just simply have access to bits and pieces of info.
Ciao