Thank you, Vince, for your thoughtful explanation.
I owned an SP in the 70s but – like many others – preferred the viewfinder setup of M4 & 35mm. Lately, however, I've been using S2 & 50mm, and also bought a black S3 2000 LE and the Sonnar 1.5 in S mount. I've recently seen both Exc+ S2s and 'new' Millennium S3s at better prices than I paid.
I find them beautiful, practical, and rewarding in terms of image quality:
--IMO they're beautiful works of Modernist design.
--I want my film cameras to feel quite different from my digital M, so that I don't take off the bottom to extract the card – without rewinding the film.
--And especially, Sonnar (Nikkor) wide-open bokeh is so attractive.
Collectiblend shows graphs of Nikon RF price decline. And I believe prices have dropped in just the half year I've owned the S3 2000. But that may be partly because people want to sell more than buy older user/collectible cameras at the end of a year?
PS to Dez: You can read on the Internet the story of Nikon's engineering project to recreate the Millennium cameras, at greater expense than they could be sold for. The bodies aren't inherently better, just less used; but the lenses differ (50mm in design and coating; 35mm in coating). And it was SPs, not S3s, that mostly had ti shutters. As to reproductions costing more than originals, it's not always so. The originals that collectors want (as distinct from originals in user condition) cost lots more than the reproductions.
Re: S3 2000 cloth shutters with pinholes, three of us have recently mentioned that. But Jon suggested this is coincidence and not an inherent flaw. I just don't know.