Well, alot of the DS and GCN (as well as PS2 and XBox) kiosks I've seen have been manhandled beyond recognition. Scratched screens, analog worn out, flat buttons, etc. ...all within a week of putting the demo unit out.
I believe all that makes perfect sense if some of the revo's rumored controller features are true. Think about it, if the revo does make use of gyroscopic control, that would mean the player would have to jerk the controller all around... demo controllers now are bolted in place with the cords secured in metal housing. Pretty much, I like the idea of the Revolution's controller to be an untamable beast.