Few moths ago I visited an exhibit of Marc Lagrange
http://www.marclagrange.com a Belgian art photographer, sadly died to early.
A buyer asked the price of one of the fine prints.
“40.000€” said the curator.
“You see, sir. This is a Palladium print, very rare procédé !”
They negotiated a bit and the buyer pulled his wallet at 37.000€ and walked out in the knowledge he made the bargain of the century. After all, it was n.28/30 and according to the seller, in photography: the higher the number, the better.
(Marc Lagrange was one of the rare living art photographers making a lot of money out of his work)