I've heard it said that the 955 is the "Cadillac" of CUTs. As the owner of one with 315 hours on it, I wouldn't call it a cadillac. It's much more capable than its 33
HP would indicate, but it does have some issues. Like the poorly engineered battery placement that rots out the $450 grille, and the inavailability of the odd sized tires.
Getting back to your question, I don't really know why the prices remain so high for the 955, other than maybe it's just popular but not necessarily a better machine?