If digital art is as valuable and worthy of recognition as physical art, then look at it through lens of the difference in price between the original Mona Lisa and replicas of it.
But...I do not see the value in being able to "prove" that you own said artwork...because you can't do it...Globally, the number of people who know what Ethereum or any other block-chain technology means is probably what..many thousands? Maybe..maybe a few hundred thousand? And of those the subset of people who actually care...I'm sure is far fewer. So you can only verify yourself as the "owner" of said art to a very small subset of people...
I guess it's like a collector community? People are willing to spend literally millions of dollars to prove to other collectors that they are the owners of these digital assets?
This has been coming a long time. I have about 3000 hours in guild wars 2, when I log in I’m always so happy I have my legendary longbow. If they’d have been nfts that would be amazing. I’d love for that metadata to travel with me across other digital worlds.