All kidding aside I think the real point is that NID's offer a lot for a small price. Modern steel, solid design, modern stock dimensions, reliable function and easy to get repaired if a part breaks. All this for less than a grand in high condition. I bought a pair of 12's, from a board member, for about 700 not that long ago and they have been great rainy day guns. You can even find a nice 20 for under a grand and that is almost impossible these days for a Parker, Fox or Smith. Price wise they are stuck in between the low ends like Nitro Specials and Crescents and higher priced Smiths, Foxes and Parkers.

Style is very subjective and opinions of what looks best does enter into prices. I like how a NID looks and the supposed better looking "other" makes were not saved by their good looks. They all went under and most of them long before the NID was ended. Also numbers of gun left does help NID low prices because late production guns are more likely to still exist than guns made 50 years earlier and we are talking about guns that were all made 70 plus years ago for the most part. Rare does increase price when you want something.