Yes, I agree. Some books are like magazines and you'll only read them once. Others are treasures that you need to hang on to. I've kept all of my books for sentimental value.
I started taking books out of the library again and I'm so glad. Some of them have only been so-so and I'm glad I didn't shell out lots of cash for them. But you're right, the library doesn't get new books in as fast as the stores do.
I will go check out that HSP book though. And if I think it's a keeper, I'll buy it. I was on my lunch break when I went to skim through it. I didn't have much of a chance to find anything meaningful in that short of time.