Alright, the title is misleading. We are talking about showing off your love for a certain something. While most people would turn their heads at too much clutter in the open, the restrained display of your beloved objects helps keep your mind sane and gives your home that lived-in feel (still thinking about that show-flat look?).
So, how much is really too much then? There's no straight-forward answers, but these examples might hopefully give you some ideas.