You know, you're essentially standing when walking...
Most of these trips are relatively short, somewhere around 5 to 20 minutes. Nobody is touring on a scooter.
The Segway form factor is remarkably maneuverable and space efficient for one person. But it's not $3k better than a bicycle or cheapo electric scooter. People are also familiar with riding bicycles, so there's no learning curve for scooters.
