Expensive Tube Amplifiers

I would and I have paid that much for tube amps, very happily. 

@dogearedaudio, The website articulates the unique design/capabilities of these amps in greater detail than I can. You may want to start there to gain an understanding to address your question. 

I can attest that these amps work very well with Magico speakers. Magico has a reputation of being hard to get right within a system, they mandate scrutiny of all components down the chain. It is not uncommon for audiophiles to give up on them before reaching the potential of the speakers. The old rule of thumb of "spend twice on speakers as amplification" is closer to inverse when applied to Magico. Thus when "stretching" for end game speakers there may not be a lot left over to update other components within the chain.

I didn't hear anything at AXPONA that impressed me beyond what I've already heard from the Magma M's. Hence, world class.

I have the magico q 7 a d love 700lbs of speakers.they do love power mci tosh 1.25 kw or bryston 28b3 or hegel 30 a all sound good with either soulution pre or dan dagostino or mc 12000 tube. Enjoy the music stay healthy

I don't deal in high powered PP tube amps any more, but for SET and low power PP there are plenty of modern offerings that will likely be superior to most vintage pieces. This is the golden age of low power tube design in that we have so many wonderful modern variants of film and electrolytic caps, resistors, transformers, tubes and many other parts to choose from. The circuits used in these amps are tried and true so what's not to like. 

My present amps include 845, 300B SET and Bendix 6094 PP, likely soon adding 50 SET., pre's running 101D, Cunningham 71A tubes. And I can easily modify these to exact sound preference desired by easily changing out parts in these point to point wired circuits. I don't need or desire vintage equipment with all these modern choices. High prices in vintage market driven  by collectors for whom the equipment matters more than the sound.

You get what you pay for..

For great quality amps, their IRON alone cost thousands of dollars. And doing parts upgrade as the OP posted above, those caps and resistors can also add up for a few thousands too.