Thank you.
The way that I have always understood it, and the semi-joking/semi-serious thing that my instructor has always told me, is:
Once you learn the rules of music, you can go ahead and break them all.
Maybe I'll come back with a piece that uses the Inverted Picardy at the end of a movement to lead into a more sullen movement and this 'oddity' will become more popular?
Or maybe I'll be the only person to really find a use for it, and everyone else will continue to say "it's ridiculous" or "hey - you can't do that!".
Thing is, you can criticize me all you want for it; I'm going to go ahead and do it anyway ;)