yep, it's not cheap. i made one with 10 pages and while it may not have been worth $40 as it is (it is very, very nicely done, but $40 is quite a bit), but i made it to take it to my grandparents in japan whom i get to see once every two years or so. they absolutely loved it and that was well worth $40, no doubt.
i think a 50 page book will look very impressive. it's a lot of money but i don't think you will be caught wondering too much where the money went...