Originally Posted by
sweet sparrow
You don't want to know how often they're used. :-)
I have several where the professor used one chapter for the entire year or even just a few pages. Then they release a new edition the next year so you can't sell them. And of course, you always find out after the return period, which is the first month of class.
It's also illegal to photocopy the entire textbook and return it, or so I hear... ;) Another alternative is to purchase on Amazon where they may be cheaper, or share with a roommate.