How did the "artist" get the photos off the webcam?
http://mashable.com/2011/07/07/secret-service-apple-store-ar...
Cameras, cameras everywhere, and not a shred of privacy left.
Because the benefit of letting people do whatever they feel like on the display units in the store - while a good number of them are shopping for said equipment - is worth more than the cost of automatically wiping the machines each night.