Books are a racket. Nothing more.
In my major, we used our texts pretty extensively (engineering). We'd take a 200 intro course that requires a $160 textbook and wonder what the fuck was the point. Then we'd take the 300 and 400 level sequels and use the book for a couple of hours at least a day. Still, my asshole would get pounded every semester as despite re-using books, my totals would come out to be about $600. The book prices increase at ridiculous rates. One time a book was $125. Six months later, it moves up to $161. It wasn't a new edition either. Same book, both were new, but somehow, the price was jacked up $36.
In fact, in general, college is nothing more than a racket.