Originally Posted by
kamikasei
Let's say n people can fly a plane. Now let's say I have a plane which for some reason only redheads can fly. Since this additional restriction cuts down the number of people who can use it without making it any more useful to those people, you have a smaller pool of end users to sell to, thus less demand. I'm not saying something I can't use is worthless to me, but of two identical things one of which can be ultimately useful to three times as many people as the other, I can expect to get a higher price for the more generally useable item.