I used to buy good used equipment that was sometimes a few hundred $$$ off the retail price to 1/2 the retail price. Most of these pieces have been sold for sometimes more than what I paid for them to a few hundred $$$ less. Anything new (audio piece, car) will depreciate the minute you bring it home.
As for vintage equipment, been there decades ago but will never go back except for a couple of model separates. I used to own top of the line equipment 45 years ago, have repurchased some of these pieces for secondary/third systems and they just don’t cut it compared to todays technology, except for a couple of pieces which go for many thousands today, then you have to worry about failure rates/parts which are very rare. IMO of course