Music.
I can enjoy great music on a lousy system, but I prefer a great system, and I am blessed to have one--and blessed that it was less than $50k all-in. I am also blessed to not have fallen prey to the perpetual dissatisfaction that can be a part of the experience for those who are drawn to great reproduction, though I can certainly sympathize with it.
I was beguiled in my high-school years (late 70s) by ads from Marvin Electronics in Ft. Worth, Texas. I still recall their ultimate system consisting of Macintosh electronics, Studer Revox RTR, a Gale turntable, and Dayton-Wright electrostatic loudspeakers...So I have a pretty deep legacy of interest in the highest end, which has always been (sometimes slightly, sometimes greatly) beyond my financial reach.