I disagree with your analogy that "Digital ownership is like putting your name on a building, like a museum." The main value of putting your name on a building or museum is the branding value, and that's not the driving force behind the value of an NFT.
The analogy that DID make me understand NFTs is the traditional art market. When a painting sells for millions of dollars, basically all of that value comes from the provenance of the artwork, not the artwork itself. That is, with present technology it is possible to make an extremely detailed replica of, say, "The Portrait of Adele Bloch Bauer I", one that was indistinguishable to the human eye from a distance of a meter or so, that would sell for a few grand max, not the $135 million of the original.
Thus, if humans are capable of assigning a huge amount of value to provenance, why can't this be applied to digital artwork as well? IMO, though, since digital copies are exactly identical to the original (unlike physical objects), it remains to be seen whether humans will value this concept of provenance the same as they do in the physical world.