I have land on Sandbox game. Which didn't cost a lot when I bought it initially (like $80) and is still worth much more than initially paid while the game is slowly still majoring. Could have sold them for 15k each in the NFT hype but I rather build my imperium in their universe one day :)
Current market value is at ~$600 and it's a playable game with actual users getting regular updates. It's more or less the maximal value of all NFTs I can remember right now.