Can Universities Give Us a Break on Books we no longer used?

Just yesterday I bought a book for my online course at Eastern Michigan University. When I bought this book it was over a $100. So I as the cashier if I could sell the book back at the end of the semester. He simply replied yes but there will be no money to get from it because a newer edition will be used. This made me frustrated on how universities and colleges work. Now we spend so much money going to school and buying books. You think we get some sort of break when we return books we no longer need. I bet there are lot students with books they couldn't sell. So what happens to them. They sit on a shelf or take up space in a corner somewhere. It's not of all books; some are relevant to what we are attending school for. Though for the ones that has no bearing on what we attending school for...can they please take the books or have some place to dump these books? It's a cost that we absorb if we use them or not. So why gives us some incentive for returning books we longer use or don't have an interest for?