My JCM900 cost me 1200 wayyyyyyy back in the 90's when I bought it new....
Believ it or not Axe is advertising these still with a jacket!!!for $1435...
Good LORD! For that kind of money, you should get a vest and two pair of pants, too!
Seriously, there is the matter of selling old tech for high prices. Seems anything that has somehow gained some "vintage cache'" will sell for prices way out of proportion to the R&D costs, which were paid for decades earlier. Consider motorcycles: Hardley Davidson's "newest" motor was introduced in 1999*- that being the Twin Cam, and the motor in the Sportster is hardly-davidson changed since 1984- or 1957, depending on how you look at it.
Contrast that to sportsbikes, which receive a major redesign every 2-4 years (Suzuki is the best/worse, usually redesigning their GSX-R motors every TWO YEARS!)- at least major enough that you can not use, say, a 2002 GSXR motor in a 2000 bike.
My point being, once folks get nostalgic about something, the rules all change. That said, of the guitar amps I own and have owned, my favorites are all... tubes.
(*The "Revolution" motor was introduced in 2001, but that motor is widely ignored and/or hated by both the HD Motor Company, and the HD faithful. Further, the motor was NOT developed with Hardleys in mind- it was
supposed to be the "new" Buell motor, but HD could not leave well enough alone, choosing instead to insist that Porche Design (who acually developed the motor, making it more of a Porche motor than a Hardley one) modify the design from it's original, to the point where the motor was completely unsuitable for use in the Buell sportsbikes- Eric Buell came to hate the motor, too, but for entirely different reasons that HD did. Hardley, having spent millions on what became a white elephant, had little choice than to develop a bike to put it in. Few if any of the Hardley faithful like that bike.)