For the bike yes. As an art project, maybe? Art has no intrinsic value nor easy comps. If someone wants it and is happy with the price that's what it's "worth" today to that person even if nobody else feels the same way.$4000 is still way overpriced.
it was last posted at $1000 I believe and even at that price it isn't worth it. Except maybe in a zombie apocalypse where armoured steeds would be in demand.