I think that the true value of NFTs will come from interoperability, where there is no central authority, and you can treat it as a sort of cross-platform standard for verifying ownership of digital assets. This doesn't really apply to concert tickets (except if someone grants some special privileges to people who went to a certain concert in some unrelated virtual space), but there are advantages to not centralising authority for certain things (say, domain name ownership, why should ICAAN control that).