"Value" in digital cameras can be looked at from the POV of actual money lost, which makes Leica look less well, or as a depreciation percentage when it looks better, consider:
UK Launch price of M8 £3,000 now £1,000 lost £2,000 or 67%
UK Launch price of D200 £1,300 now £180 lost £1,120 or 86%
You can decide which was the best buy, the camera that lost you 86% of its value or the one that lost you £2,000.
Medium Format ( a broad definition ) is famous for digital value drops:
2008 Hasselblad H3DII 39 body only - £21,502.50
2017 e-bay sales around £3,000, those asking £5,000+ don't sell unless lots of extras, like a lens :grin:
To some extent that is due to the numbers being used professionally and "writtten down" on accounts. The S has had lens reliability issues and competes in a difficult, limited market the future of the line may be in doubt as unlike the M it struggles for a USP.
The brand argument reminds me of the conversation I had recently with one of our cosmetic surgeons who performs both breast reductions and enlargements. He says both patient sets are equally delighted with the results of their surgery and neither side can understand for one moment why the other alternative is ever performed.