You need to explain that, though they are generally rich, it's not unusual for unheard of princes to occasionally fall on hard times and have their fortunes compensated until they are able to pay a ransom to get a corrupt bank or government to release their vast wealth back to them AND that they are almost always grateful to anyone who assists them in paying that ransom.

Oh wait, sorry, wrong scam.

Wouldn't you find it useful to be able to prove that you paid for something? When you buy an NFT, you're buying just that: the ability to prove that you bought it. And sometimes it even comes with a copy of an image or a spaceship you might just be able to use in a video game or just hold on to until we develop the technology to live in video game spaceships and you sell it for massive profits!