Not at all clear that's true with much NFT.
So that they can, uh, have photos of their wedding?
> given that a wedding might end up divorce
Why do anything, then? Why have a child, they might die? etc.
That's about the worst example of people paying more for something than it is intrinsically worth that you could have come up with! People pay lots for wedding photographs because they want good photos, you're paying for an entire day of a skilled person's time - actually more because they usually edit the photos and produce some kind of photo book - and because there's high demand for wedding photographers.
People don't pay lots because of price speculation for their wedding photos!
A better example would be modern art, or maybe MTG cards.
Most NFTs don't have much intrinsic value to anyone specifically apart from the belief that it has value to others and thus it can be sold (i.e. converted back to money).