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Correct me if I'm wrong, but I believe that JK Rowling intends for all the profits of her own Harry Potter reference book to go to charity. That puts to rest all of the greed arguments that the Rowling haters are throwing out there.
Also, I question the timing of this "scholarly" book. The series has come to an end, but the movies are still going strong -- the people behind the Harry Potter Lexicon are just trying to cash in. The inherent nobility of the scholarly argument can be chucked out the window. A lot of people will pay a lot of money for this lexicon. If this were about "Ulysses", I don't think the publisher would be pursuing it so fanatically, because there wouldn't be very much money involved.