An NFT is not just an image. As far as it's been explained to me by a professional in law, an NFT is closer to something like a digital ticket/access to a digital product. That product can be an image, a video, a song, an entire concert, or even simply access to more NFTs.
NFTs initially belong solely to the creator who can then keep or sell it. Critically, NFTs also carry residuals (made up term. I am not a lawyer) to its creator.
For example with the NFT Birkins, Rothschild may have sold the original NFT for $450, but every time those NFTs are sold, he will receive a percentage of that sale.
Made Up Example:
Initial sale = $450
Resale 1 = $2000
Let's say that Rothschild has a 20% (made up number) residual* gain every time that NFT is sold.
Then after Resale 1, Rothschild gets $400
Resale 2 = $1500
Residual continues, Rothschild still gets $300 from that sale.
Total gain so far from 3 sales = $450 + $400 + $300 = $1150 and will continue to grow every time that item is sold.
So why would someone ELSE buy the NFT?
In theory because you can sell it at a higher price than you bought it for. Or the NFT offers something exclusive. (access to Beyonce's exclusive concert for NFT holders only)
The advantages for things like digital concerts makes a lot of sense because it allows people access to an experience they wouldn't otherwise be able to have without digital space. An NFT means that access can still be bought and traded perpetually so long as the servers work. All the while Beyonce gets a cut every time the NFT tickets to said concert are sold.
That being said, the fuzzy birkin is a messy and rather lazy way to create interest for that particular NFT. I am a professional writer in a different field where NFTs are being explored as a method to provide living wages for starving authors through access to exclusive content. Of course that means the Big Publishers and other major media conglomerate (my previous industry) are also looking to see how they can use this system to their financial advantage.
The fight will continue, but either way there is a lot of money to be made and so of course everyone is trying to rake in the profits before regulations start to reduce the potential gains from this new market.
(And I haven't even touched the moral issues. The most obvious is the electricity required to keep this system going, but there are tons of ethic concerns. Again, I'm not a lawyer or anything but a professional trying to figure out what to do with the NFT clause in my potential publishing contracts)
edited several times for additional info an clarification.