A website called Read it Forward has a great essay here on why the author won't borrow or lend books. What I loved about it was his gripe that when friends gave him books to read, he never wanted to read them because he was going along his own reading path, and this book would interrupt it.
This is what I saw in my high school English classrooms. For my money, the most deadly thing about English curricula is all of the required books kids are given to read. It would be so much better if they were given the freedom, and help, to start establishing their own reading paths. Assigned reading tends to drive out all other reading, and many kids don't even do the assigned reading. So they read nothing.