Earlier quoted context omitted.
This is already a famous NFT. "Remember when John Cleese sold the Brooklyn Bridge? Look, I have that NFT that he sold!". Heck, I would even pay money for that. First of all for the bragging rights, and second of all because I'm sure plenty of people would pay for it. But $50k is a bit over my budget ;). But in no way am I surprised that there is somebody out there that wants to pay this amount. If anyone is surprised…
Just tell people you own it. Venmo me $5 and I’ll put your name down on the blockchain (a public Google sheet). It’ll have the same effect.
This is the key conceptual leap you have to make to understand NFTs, or cryptocurrency for that matter.
The blockchain is a consensus mechanism, with the emphasis on consensus.
A lot of people agreeing on something having value means that it has value to those people. They can then exchange that thing among themselves and thus transfer the value.
One person saying something has value means it has value to them. If no one else accepts it has value, it can't be used to transfer value.