I'm still holding on to unused gear I purchased at the nadir of the tube era in the 80s. I have a pair of McIntosh MC30s (paid $150), Fisher 400B & Fisher 500B (paid $125 each in mint condition). Marantz 7C (paid $75), Dynaco ST70 w/Mullard EL34s (paid $400) and smaller items whose values have escalated substantially. Their current prices really astound me. However, as to CD players, I sold my $3500 Muse Signature 9 last year in almost unused condition for $500-older CD players, even high end one's have plummeted in value.The truly great vintage is pretty costly these days.
Good vintage, if you know what to hunt for, can be a deal.
One day I would like to assemble a little system based on old broadcast modules ( a Siemens / Telefunken V set ). I wouldn't expect it to topple giants but I have a thing for old industrial / studio gear...