Textbook reps are like Big Pharma salespeople.
In the academic world, professors and faculty often meet with representatives of textbook publishers. These book reps like to stop by, or send an email, every so often to ask what my colleagues and I are using. My university uses a textbook rental system, which locks us into a particular book for a few years. When a book comes up for new adoption, you will surely see a book rep encouraging you to pick one of their textbooks.
Let me be up front and say I like these book reps. They are nice people and I enjoy talking to them. Even after adopting a publisher’s textbook, book reps often help out with extra material (like online supplemental material or instructor resources). However, I don’t always agree with the sales pitch. Let me go over a few. (Source)