I agree with the prices being dated but the prices are such a small part of the books. They are so pretty and well put together in all other ways.
I suppose it depends a little on your character - some people like a physical book or list to refer to, things they can touch - others prefer everything online and constantly updated. I agree I am the later - I prefer websites and online galleries to the books but I can completely see how as a collector a book filled with pretty pony pictures appeals!