Good morning, Flying Camera;
By the way, I use a Cessna C-172 for that.
First, I do want to thank you for the admission that they [KIRON lenses] may in fact be optically excellent.
However each person evaluates a camera is still up to them. They can decide even whether or not they are going to buy a camera, and they and the seller must agree on the sales dollar amount. In the end, between those two, that will determine the "value" of the camera and/or lens/lenses. However, their chosen "value" is not necessarily binding on others, although it can be influential.
Still their financial evaluation does not affect the intrinsic value of the lenses.
And to someone who has a Contax camera, those Kino Precision KIRON lenses, even if not made by Carl Zeiss or one of the other "bespoke" lens makers, could very well represent an excellent value. To maximize the dollar amount to be exchanged, it is helpful for the seller to find someone who has a true need, or at least a very strong desire, to find lenses that will fit his camera. Then while the dollar amount may be higher, each one may feel that they got a good "value" for the sales amount involved. Getting those two people together is the real challenge.
And, as a comment about the significance of the Contax-S, the ENTIRE Single Lens Reflex camera industry and community -- including the modern Digital variant -- has the Contax-S designed in the very late 1930s just before World War II, but not produced and brought to the market by VEB Zeiss Ikon until 1949, to thank for their basic design and shape which has persisted as a testament to functionality up to this very day. The Zeiss Ikon Contax-S brought together the elements in one camera body that defined the SLR camera as we know it.