Re:Price != Quality (Score 5, Insightful)

I agree. Many textbooks are used because of ties to the faculty of the deptartment. For instance, if a professor at a given university writes a textbook, and has a lot of say in what goes on in the deptartment, you can be sure that soon enough most other professors in the deptartment will be using their book. It's just the way university politics go.