It's kind of funny to see people here on a website say, "Welllll, it's perfectly okay to download it w/o paying for it, because it's a textbook and textbooks are overpriced and I couldn't afford it anyway.... and big, bag textbook companies shouldn't get my money... poop-noise to them."
BUT....
Whoah, wait, I sure hope nobody illegally downloads my book someday. That's bad.
Really? So, there are conditions to these morals? Got it.
Can't afford textbooks? Well, golly, I'm sorry. You're in college. You're a grown-up now, right? Maybe you didn't think these things through all the way if you get to this point, pay for all the other college expenses (fees, tuition, parking, food, gas/car) and oops. I didn't consider that I'd have to buy books. What happens if you run out of money halfway through the semester? And you can't illegally download money to pay your bills?
Sure, textbooks are expensive and yeah, that's a problem.
HBO is expensive.
Car insurance is expensive.
My gas and heating bill are expensive.
My pets are expensive.
I'm not saying that people won't go and download books and that it's not a viable (albeit illegal) option when a textbook is way too expensive. But how about we don't pretend that this is the one instance where it's morally justified because we decide it is. Seems a wee bit convenient.
As for students having to buy a teacher's work, I've seen this go either way. One, a creative writing teacher that a pal of mine had forced students to buy her self-published romance novel for the class. That was a big WTF to me.
One of my instructors during graduate school had us purchase his textbook. He was teaching a class on a specialized topic of which he was probably one of the leading experts in the nation. There were only one or two other books out there like his. His was not only the better rated version, but the cheapest by far. And, most of the copies in the bookstore were used, so I don't imagine he got profit from those.
Sorry to sound like a spoilsport for people desperately wanting to justify all their pirating, but yeah. You're really no different than some dude in a basement giving Showtime the middle finger because you just don't want to pay to watch Homeland. And if you're okay with that, hey... all the power to ya, but let's not pretend there's some kind of Robin Hood, benevolent act going on here. Really, there's not.