why are old school amps worth so much?

If I recall correctly there was a Blaupunkt car amp that was designed by California Audio Labs back in the early 90's. That thing had a ~750W power tranformer in it and the linear circuitry was spot on. It was the best car amp design I had seen at the time, back when I did installs hot and heavy. It'd be lovely to get a look at that again or have more info. I have no idea what the model was.
 
BUI Cruise Power

There is an auction on ePay for a pair of these amps.
 

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I've been checking for a couple so-so sought after amps, and I sure have not seen the prices go down. Some of the broken have gone up, or shill bidding maybe. At least I get a laugh when some beat broken amp sells for what I bought a working one for less than two years ago. Some normal amps have fallen a little, but spring is getting closer.

Blaupunkts appear to have gone all over the map, being made by all different places. I have some that are STK IC amps much like the ADS plates (some of them). There is some that are Zed made? Some are junky. As opposed to say Kenwood who seemed to make near the same amps for the longest time in the ones I have seen.

One time in the early 90s they gave me a 'cube amp' they called it, I never could find out/remember what it was. It was a little cube that sat behind the HU. At the time it seemed to put out way more power than a HU, but HU were low power then. I don't think they could have put a PS in this little thing, maybe it was an IC based amp. They talked like it was class D or something special. Well it worked great until you started the car and had wicked ignition/alternator noise. Tried caps and noise suppression and could not make it work.