Richard,
I think the real question here is: what makes something "vintage?"
Gear from the 60s and 70s is definitely considered vintage, even if some of that gear is complete garbage. (Think of some of the old Japanese wah pedals with built-in sirens, or even some of the early Electro-harmonix stuff). I have an early EHX LPB-1 that plugs into the guitar jack, then you have to plug your guitar cable into that. Total junk, but a guy offered me $600 USD for it.
My Strats from the 80s have been considered vintage, probably because they were made while CBS still owned the company, (even though people still poo-poo about the guitars made during that ownership). Go figure.
My GK 250ML is considered vintage. Is that because GK no longer makes guitar amps anymore?
So, what does all this add up to? Does it mean that if you label something as "vintage," you can now jack the price up to the moon?