I suppose I've had really good luck with classes or something, but I've never felt cheated or "robbed" when buying books. Actually, sometimes I feel like I'm getting a huge bargain. One of my books for this semester costed a grand total of twenty-one dollars. I get to have all this information forever...for twenty-one dollars? DEAL!
My most expensive book was $170.95, but it's a really nice book. I love hardback textbooks. They make me feel smart.
But looking at other people's experiences I can see why there might be some resentment toward universities and textbook publishers for their prices, especially considering some professors never use, reference or even look at them.
It's always good to have that knowledge bank around, though. I'm really happy that I bought and kept the ones from previous semesters now, because I often look back through them for all sorts of stuff. Sometimes I just want to fact-check, other times I'm having writers' block and need a springboard idea, and sometimes I'm just bored and want something to read.