Dean Kamen, the inventor of the Segway, had invented a wheelchair that was capable of climbing up stairs. The problem was, the wheelchair was too expensive to start to produce because of the small quantities of unique parts needed at first. So Kamen wanted to come up with something that A) was made from the same parts of the wheelchair and B) he could sell for a lot of money, thereby driving the price of the wheelchair down. That's how the Segway was born. People give Kamen a lot of crap for the lack of success of the Segway to revolutionize transportation, but that was never it's goal, it was just a high priced item to be sold to a niche market so that the price of a more useful humanitarian item could be driven down.