Devil's advocate here:
I don't know what the shop rate at Jahnke is, but mine would be north of $100/Hr if I were still in the racket. Where do you draw the line when the repair could take a couple of hours of bench time plus parts plus time scrounging up parts, if not in stock?
In an '830, if the tube shorts and takes out the cathode or screen resistors, which in turn can burn up the PC board under the tubes (been there, fixed that but I had factory-direct access to parts), what's a guy to do? How long would it take to fab a new board? Would it be economical for a shop to do so?
Often, the only source of parts is ebay; many of the breakers are/were in Eastern Europe. Who is going to do that legwork?
It's sad that it is going this way; a ham must be able and willing to do his own repairs on boat anchors if he chooses to own them, as the knowledgeable b/a techs are timing out, retiring or elevating their shop rate enough to keep the wolf from the door.

And we all know how miserly hams can be.