So if you own a certain parcel of land, what would be its use to you or any advantage of owning it? It's all digital so in reality, you don't own anything. why would it be valuable in the trading market?
like for example, if you buy the Buckingham Palace, then what? i just want to understand if there is real use case of owning the digital land. or you are just paying for the thought that you own that place? isn't it a sick idea?

0xEarth divides the earth up into 1 of 1 NFT digital collectibles. So only one person can own each LAND (or digital representation of earth).
Within the smart contract is an entire DeFi stack. You can rent the LAND for someone else to use for fees and rent length decided by the LAND owner.
So for example, you may want to get LAND near Central Park in NYC as it's a high traffic area. 0xEarth has multiple dApps in the works to enable LAND + NFT visuals across the globe.
The announcement blog post outlines this:
https://medium.com/@0xearth/intro-0xearth-3960b277f9d5