I don't know if you heard of Entropia Universe.
The highest paid item in a game was in that game (635k $).
I didn't quite undestand what this is meant to do, but is it something like that?
From what I understand (atleast I think so) is that this game utilizes blockchain, but what would it be used for?
I havent heard of that game. This game is on the network so you can have contracts and a secure ecosystem for the economy. You should do some research on smart contracts.