They go through some pretty extreme lengths to get you to waste money on buying books from them. The English classes my university published a new "reader textbook" ever quarter. It was just a crappy bounded letter paper book with section from various novels that they change up every quarter so you couldn't use an old one. The on campus copy center and nearby kinkos/staples/officemax/officedepot wouldn't photocopy it but a half hour drive out would reach stores that didn't care. A photocopy costed about 1/5 of the price the university was selling it at.