I answered a similar question here[1]. The economic value of art has historically been tied to the scarcity of access to its media. NFT presents an alternative paradigm that separates the signature (artist-signed token) from the artistic media (image, GIF, conceptual art project, etc), allowing the former to remain scarce & uniquely transferable while the latter remains abundant & widely accessible.

[1] - https://news.ycombinator.com/item?id=29160090