What you are describing is called a "Lebanese Loop"
What I'd like to see is the youtube video of someone pulling this out in a highschool sports game to take pictures of the game while standing right next to the local policeman...
The problem with that is that you still have the performance hit of calling the ROT-13 function times four (twice for encryption, twice for decryption).
I'll sell you my ROT-52 accelerator card for $50,000 which will do it all in one function call, and hardware accelerated to boot! Did I mention it supports unicode?
Given a choice between the Germany of today (ban violent video games!) or the Germany of 70 years ago (Genocide! World wars!), I'm not going to lose any sleep over their current extremes.
Just an opinion.
But is it snappier?
8 Catfish = 1 Octo-puss