Yes, I buy books, probably too often!
I love books and used to purchase them all the time. Purchased them new and never gave it a thought!
Now, I tend to borrow most books first. My local library loans ebooks as well as real books, so I borrow many current books in one form or the other.
If a book is very importaant to me - is useful or really touched me in some way, I then purchase it.
I tend to buy books on sale, at thrift stores, and especially with classics, I tend to buy hardcovers because I intend to keep them!