I’ve heard two different art dealers on different continents (SF and London) both insist independently that the primary reason for high art prices is that art is a great way to bribe the owner, or to launder money, or both. (Similar to former politicians being paid millions for a “speech” in a foreign country).
Compare this to, say, Marcel Duchamp’s ‘Fountain’ which is literally just a mass-produced urinal. ()
(
) Comically, the one on display on the Tate Modern is a copy of the original work. Someone is truly taking the piss...