The gear from the mid 1970s looked great and still does. That's what sells them. A lot of it goes to people who just want some background music on, you have that big beautiful faceplate with the FM dial, mellow blue lights behind it.
I have several vintage amps that I've restored, and frankly they're easy to work on and even improve with modern caps and transistors because it was the era just before customer integrated circuits. These will be working a century from now because they're largely just caps, resisters and transistor.
I just repaired a friend's Marantz 2285B and he loves it and he listens to 1970's music on it. It's actually a perfect pairing for the way 1970's albums were mixed, and it was the way those albums were meant to sound.