i would never imagine plugging my laptop into a building. let along take it out in a city, and while balancing this thing, i could be mugged pretty easily, or drop it. while a cord might be useful, who carries a cord around just because a strange usb thing happens to be sticking out of a wall. i can see copycats doing this only attaching live current to the other side.
---Mike Savad
MikeSavad.com