I found the price to the book to be alright price (hardcover, glossy pages and its contains very high quailty images).
The book also really gives you a idea what Munch Oddysee was orginally intened to be.
Look at it this way, if you like the art that you saw in the credits of the fisrt 2 Oddworld game and felt disappointed for them missing in the Munch Oddysee and Stranger Wrath then this book you should really be owning.
Maybe you need to show/tell your parents about Oddworld to convince them to let you buy it...
Anyway, the Oddworld art book would have be the best games art book I have, can't wait for the next ten years art book
.