Earlier quoted context omitted.
It's just digital trading cards, like pokemon or baseball cards. Just amateurs are running the show now, but the NBA already got in on this, so if you want something more legit: https://nbatopshot.com/
Hey now, they're not just "digital trading cards, like pokemon or baseball cards"! They're also an enormous waste of resources! Yeesh. At least collectors of sports memorabilia have some memorabilia to admire. I can't imagine what value-add there is for "NBA Top Shots" that I can't replicate by backing up a short clip of the play. My solution is more durable, too!
All of money is imaginary and all things have a representative monetary value. All of the above are imaginary things. Work from this basis, the rest of this will make more sense. So now if you use your imagination, we can start lining up some value. What value does gold have in World of Warcraft?