Just look at the difference between generations of analog cameras and generations of digital for much of the difference in your 120,000 and 10,000 ebay cameras.
Analog cameras generally had several years before a newer, comparable camera from the same maker were introduced.
Digital however, seems to have an 18 month interval between generations and a vital spread in types, features, pixels etc, with many of those now used cameras hitting the market so the owners can fund their next buy or upgrade and those that buy many of those two generations back cameras are just as likely to do the same as good used digitals again hit the ever growing market.
Sure, analog cameras get resold all the time, but I surmise they are finding new, long term ownership, including among collectors.
Until quality Hasselblad 500 C/M's are again produced to the same quality levels, or Nikon F2's or Canon F1 AE's, etc, the digital dross will increasingly float to the top of the used camera markets.
IMO.