Resale of an NFT is different; since you can look up previous owners of the NFT there's a way to validate "yes this NFT is the one originally sold by Elon".
The NFT has value Because it was the one Elon sold and signified as legit, versus the NFT some random person sold
The NFT has value Because it was the one Elon sold and signified as legit, versus the NFT some random person sold