Expensive paintings (for simplicity, let's say anything 7 figures or higher), especially Mark Rothko and Jackson Pollock artwork and the value some of their pieces* fetch.
*- Their individual bios are interesting, as I think are most that devote themselves to art's various forms - but 3 different colors with horizontal lines or some paint dripped shouldn't be worth 9 figures. And I don't blame Rothko or Pollock, it's not them driving their own prices up directly.
If a painting really moves you, buy the poster and have it framed for less than $200. Save the millions for additional enterprises or charity/scientific development. If it's an ego thing, they'll name a wing after you (side note, I LOVE the "The Anonymous Donor" episode of Curb Your Enthusiasm, classic!).
At least with a pissing contest for the nicest house, boat, car, clothing, etc. - all of those things have tangible function provided you live in it or drive it or wear it.