I agree: free market.
Buyer beware. I know those Marantz receivers from the '70s are eye-candy and are commanding eye-catching prices... but even their newish little nr1200 sounds a lot better to my ears and has a lot more features including streaming, hdmi, optical, sub out w management, remote control, etc. etc. So, although the 2238 was drool-inducing to look at and I did enjoy listening through it, after I compared the 2238 and the 1200 head to head, I was actually distressed to find how much better I liked the newer receiver; but... so, I sold my professionally recapped 2238, as much as I loved the look of it, to a willing buyer for $300 more than I paid for the nr1200 including tax, shipping, and a five year extension on the warranty...
But check out what some people are asking and some people are paying for those 70's Marantz... don't get me wrong, they sound good and they are amazing tactile pieces and to look at, but...