Hmm... Well, for one, I actually wanted to just be able to say I did something so random, and for two, I actually wanted to have the USB port on the Robot controller, rather than on the OI. Specifically for the sake of using a) using a webcam, or b) using two mice for dead-reckoning.
Practical purpose? Perhaps not, but you gotta admit, it'd be pretty awesome just to say you did
What about interrupts? Those are polled in the fast loop, are they not?