My goal is to spend 20 bucks a month on physical books. I've been reading exclusively on eReaders since 2009, and I've become a little insecure about my shelves being filled only with plushies and comic books now that I'm in my 30s.
I don't want to accumulate too many books, but a few just to signal to guests that yes I do in fact read might be a good idea, even if it feels a bit vain.