Publishers claim texts are labor-intensive, difficult and expensive to produce. The Open Textbook Initiative is working to replace costly texts. Our library has expensive texts on textbook reserve. For more on this debate check "Atlantic" --> http:goo.gl/e11jy7
They also aren't expected to sell as many copies long-term so what might be an $18 book marketed for recreational consumption is raised to $60 as a textbook. -Source: employer wrote textbooks for a living