I don't think you can put a price on it if we are just talking HE sound.
I have heard some extraordinary music coming from DIY type tube gear.
To me High End has the look, the feel, & the sound. Beautiful pieces..you know what I mean. You open them & every part down to the screws & resistors are top shelf. Cables, connectors, knobs, whatever is in eye's sight looks & feels like a million bucks. Match that with beautiful sound & I'll say that's some High End equipment right thar'.