Before we had kids, we were the kind of couple who would go out to dinner on a Friday or Saturday night and then spend an hour or two perusing one of many local used bookstores (all have sadly closed now). We both love books. We have always had dreams of having a big, thorough library - probably for different reasons, but nonetheless. We inherited a couple of large solid oak bookcases from my parents and both, at one time, were completely full - and my husband has a third one at his office that is also completely full. We own a lot of books. We own a kindle too, and see the convenience of it, but we still have a thing for real books.
Having kids and living in a small space has temporarily dampened our dream of a giant library. We had to condense down to one bookcase in our dining room. The rest of the books were either purged or are boxed up in various closets around our place. Being the purge-queen that I am, I took a very hard look at the books which were mine and got rid of A LOT of them, thinking they would be replaceable easily later on. My husband, however, monk that he is ordinarily, just couldn't/wouldn't purge his books. So, someday I hope we will have an office where we can do a whole wall of built-ins.