My opinion...
1- much less of them made, so they are more expensive then o/us
2- built better, point better and make for a quicker more accurate shot, target shooters (and I am one) like 0/U/s because you know where the target is coming from, I hunt with a sxs because I do not know, and they have a better sighting plane for quicker shots.
3- they are a hell of a alot sexier, and everyone knows sexier means more money!!