Why is it my boxed set of the Lord of the Rings/The Hobbit only worth one credit?  I paid much more for it than that.  Just curious.  I'm going to remove it and keep it if that's the case.

PBS rules are one book for one credit, and posting it under the Boxed Set ISBN, it seems like 1 book to the system.  Either post the ISBNs of the books separately to get the additional credits (risking breaking up set to different requestors), or better yet, post in Book Bazaar to get 1 credit per book.  Offer the set of four books to first person to PM you willing to buddy you 4 credits. 

Just remember, you can't ask for more than one credit per book per site rules.

Boxed sets count as one.  Only audiobooks are 2 points.  So, whether your book or set of books was $1 or $100 it would still be one credit.   If the books have individual ISBNs, you can break up the set and post them separately to get a point per book.