Wayne,
I found it far more pleasurable to read the book(s) than any spreadsheet could provide.
Agreed, I have enjoyed reading the books and return to them quite often. But this is more of a data issue and I think it would be interesting to have summary data, at least for those of us that are quant nerds. Like how many courses by country that are ranked 10, 9, 8, 7, etc.
Ideally someone would create an exhaustive database of golf courses including location, date built, reno dates, GCA(s), status - private/public/resort, green fees, rating inclusion, etc. Something much more inclusive than just the ratings from the CG.
I am in Canada and have a spreadsheet that I maintain with ratings history for the SCOREGolf Canadian ratings since 2000, and I also include Doak ratings, where available, and other ratings. But it isn't easy to maintain as names are not always consistent from one list to the next. I have to think that there are folks in the US that have similar lists.
To be honest, I am surprised that there isn't a website with such a database, given how the internet has niche sights with amazing minutiae in some areas - take hockeyfights.com as an example.