They're not good markets, and even if they were, they fall far short of the Segway's original goals as a mass consumer product. There is a reason Segway is often used as a cautionary tale in product circles, and as as "What not to do" case study in academia.
I remember that they were promoting Segway as the way of the future. That it was going to change the world. They literally said that their device was going to change the world like Ford did.[1]
Fun fact: One of the original promotional videos shows cops using it.
