To be fair, the book you quote a price for (which price appears to be a bit higher now) is a reissue that comes from a different publisher. Perhaps Logos can renegotiate this title with the newer publisher and revise their price. Such trivialities may mean little or nothing to us in the long run, but they can effect the offering price considerably, especially is this is a thesis--there is a tradition of charging through the nose for theses by the publishers who carry them.