The hold in value is an interest aspect, I agree, the Yamaha A-S3000 transmit me a feeling, that can be a future classic device, in fact, the whole design concept (internal circuit, functions, aesthetics) is like a classic integrated from late 70’s early 80’s.
but hey.. the Marantz Reference line also holds his value pretty well, no?
Like the SC-7S1 Preamp and MA-9S1 monoblock, think they costs more now days used, maybe even the SC-11S1 preamp and SM-11S1 stereo amp are holding his values pretty well...
Agree that the PM-10 feels like a gamble on the value hold aspect, maybe because it's a Class D amp..