OK, so you get to the store... What do you do with the device? Can't leave it outside, at the price it costs! Can't really bring it inside either, it's too big and heavy...
No again, I see 3 problems with this device before it can be considered acceptable: too heavy, too big, too expensive.
But, what's wrong wth riding your bike to the store again? I didn't understand that part... Too dangerous?? How is the Segway safer than a bike? You'd have to ride in the street too, since it could be hazard to pedestrians on the sidewalk.
But again, as I said to BoXXi, this is a free world, you can waste your money the way you want.