As it happens, I did a quick-and-dirty version of this analysis yesterday—see this spreadsheet. It looks to me like Goodreads is actually helpfully aggregating ratings/reviews across editions (if you click on any one of the editions here, it shows you the same figures), and the rate at which the aggregate numbers have been going up seems to have increased meaningfully since the relaunch, which does seem to provide additional (encouraging!) evidence regarding its impact.
Thanks for doing this, hadn’t thought to use the Wayback machine. Really cool to see the quantitative perspective line up with our qualitative impressions!
You can get more granular data on the number of ratings (but not reviews) from this page.
Nice, so we should buy the rights to all the other EA books...
A related idea would be to buy copies of e.g. the precipice for university libraries...
Good idea, but one issue with donating books to a library is that the librarian still has to decide whether to accept or reject the donation. Most librarians are very selective about what gets included and what gets weeded out of their collection.
Another option is to use the library website and find the “Suggest items for the library” web form. (Search the library catalogue first to see whether the library already holds the item.) If the librarian decides to purchase the book, it is completely funded by the library budget.
You can suggest the format too: print, ebook or both. I would say both because both print and ebook formats have their respective strengths and limitations.
For university libraries, if you mention the course or unit (e.g. ethics, philosophy) that would benefit from the book, it helps the librarian to justify the purchase.