Earlier quoted context omitted.
This is a bit different, I believe. Segways just do not look cool, and you would be kind of embarrassed riding one, unless you really don't give a fuck what the world thinks. These on the other hand are cool enough that you are ride them without looking like a clown.
Interesting fact: in Prague there are people offering sightseeing tours on Segways; it seems to be quite popular there.
I can't imagine how tours would be able to operate 12-15 mile 2 hour "walking" tours otherwise. You're able to see a significant part of a city from eye level without a huge amount of physical effort.