Buy. For two reasons: I want to have a personal library someday, and I want one big enough to take up an entire room. I also plan to bequeath said books to the local library when I die, can't give what you don't own.
I ain't thirsty. There's plenty of fish in the sea, but I don't want all of them, can I have some standards? Or do we just have to settle, for someone's who meh and will do.