Reading generally fulfills one of two purposes for me: Escapism or expansion.
There’s no such thing as having too many books, but I do feel more than a little gluttonous owning so many books I’ve not read.
My “pile” hasn’t been an actual pile in years—rather, it is an entire bookshelf all its own. That’s right, I have a whole bookshelf in my office that exists solely to house the books I own but have yet to read.