Actually I can think of a pretty large market, one I happen to be part of, that IT would be very useful for: college students. Here at the University of Michigan, people have a variety of things: feet, bicyles, scooters, etc. that they use to get to class.

For close classes, walking works fine. However, many classes are sufficiently far that walking would take too long, so people either take the bus, or ride a bike. Waiting for the bus is an inconvenience, and I can attest to the fact that bikes and sidewalks don't always mix. Getting hit by a bicyler is *not fun*.

IT could be a great middle ground to get to class (or the store, etc.). Of course, the fact that it's a $3000 piece of equipment means it's not a good thing to be leaving around a college campus. But sometime in the far distant future when these things are priced so that a college student could actually afford one, it could be a huge hit.