[JumpCrisscross]

> Beyond some amount the absolute amount of money really stops to matter

At national monetary scales, sure, because more spending would be inflationary thereby decreasing one’s spending power. So call it a trillion dollars or so. Not a practically relevant cap.

[mcguire]

AFAICT, the most expensive yacht is the History Supreme, which is only 100ft but is built from, among other things, 10 tons of gold and platinum. $4.8B.

Then there's the 155m Streets of Monaco concept (https://archive.curbed.com/2013/7/15/10219720/inside-streets...) which I would not touch with a 40ft motor lifeboat. $1.1B.

Elon Musk famously found a way to spend $44B on Twitter, which pretty impressive.