I was a student until recently too. It's normal to read 50-100 books a year in many disciplines. When I was expected to read these books, you know where the university made them available? In the library. When they weren't, the professor would order copies fo the library. When I wasn't expected to read them but I wanted to anyway and they weren't in the library, you know what I could do? Order a copy for the library, or loan from another library through ours. I assume many university libraries in the world work the same way. And students are expected to use them that way. 

I also assume that students who value books can't afford - like most of us - everything they want to read. But that then they should be smart enough to figure out they should value their libraries, not undermine them by not using them which is what they are doing. On top of undermining the people who make the books in the first place.