[js1138]

The price will only come down if it sells well enough for them to make it in bulk.

Looking ahead 10 years, the price will come down when they're made in China. The only really expensive component is the battery. Everything else could be knocked out for under a hundred dollars. Cheap fuel cells would make it doable.

[discostu]

I've already looked ahead 10 years, in that time the price will be WAY down because you'll be picking them up at yardsales. Segway will go the way of Delorean: an interesting idea with no real market potential.

Actually there are a lot of expensive parts in the Segway, the gyroscopes and controller board are probably the bulk of it.
http://www.amazon.com/exec/obidos/tg/detail/-/B00007EPJ6/qid=1064848170/sr=8-8/ref=sr_8_8/102-3830726-2475348?v=glance&s=electronics&n=507846