selling point is one thing, whether are there any market for it, is another.
just because its discontinued, doesnt mean its good, sought after or having reason for price to shoot up drastically.
and that doesnt apply to just geetar, but most of other things in life.
if theres no one interested in your product, even if its rare, one piece in the world, its useless.
if everyone is interested in it, even if theres tough competition, people will pay for it.
demand and supply is relative, the rest just flowery words to push sale.