The answer to your question is contained in the question. The first two books (Cattleyas and Laelias) are expensive on the used market. Why? Because they are in demand. The remainder of the books are available new at less than list price. The informal 7th book is still available new also.
To argue that these books do not contain cultivation/altitude information is like arguing that Alice in Wonderland doesn't describe nuclear fusion. These are taxonomic checklists and descriptions, nothing more, nothing less. They belong in any complete orchidist's library along with many other reference books.
Like someone said above....good books are never a waste of funds and will serve you for years to come. Besides, historically they are proven to be a good investment. Is history a guide to future value....no, it's a crap shoot. However, an internet page will never appreciate in value and you will never be assured of it's accuracy because any idiot can put information on the internet. At least a book has undergone some evaluation by its publisher before you get it and those that have become valuable references have had multiple peer reviews.
I own all seven books along with many others that I would not sell at any price. Get 'em if you can.You can read during the rolling power blackouts and hurricanes.
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