I never bought a lot of hardcovers. Way too expensive. I only bought a hardcover when I wanted to show it. Another reason was because hardcovers are so hard to take with you at all times (I always had a paperback with me, even if I only had a coat with me...). Hardcovers require a bag, and then they'll break easily. Wasted money.
I did buy lots of pockets. But those I'll not buy any more. Once our lounge is done, where our library will be (between now and 6 years, it should be done...), I'll start buying books again, but only hardcovers and trade paperbacks. Not so much for reading, but more for showing