I bought an amp from the 80's for $50 or thereabouts that still works like new. Nothing new would have come close to the value I'm getting from that thing and it still works like a charm.
The really surprising thing to me is that the caps are all still good, I fully expected those to give way on first power up and that's now 5 years ago.
In "bang for the buck", it's the best purchase I ever made.