I guess if the ScalperAccount has a dedicated wallet that only has one asset, and that wallet's private key is sold, sure. Of course, there would be no guarantee that you're not being scammed when you send payment and never receive the private key. When done on-chain, there is a guarantee that you will receive the NFT you purchased.
People do this today with video game accounts, usually ones that have a single game or subscription obtained through gray or black market transactions.
But in an NFT-enabled world, you would need to be signed into the seller's wallet to attend the event and it wouldn't be your normal wallet. Identity could be confirmed cryptographically with an attestation or heuristically by having some amount of additional assets in the buyer/seller wallets (because everything would go with the wallet if private keys were shared).
Also if people traded private keys in this way, they would lose out of value adds like POAPs that contribute to your history, which could be useful for getting better tickets in the future or proving social status or whatever.
In this case, NFTs allow for a secondary market to exist with additional stipulations (such as revenue sharing) via smart contracts.
Of course, all of this can be done with centralized services, but decentralized protocols have much better interoperability and trust than centralized databases with web APIs, which is the whole point of a trusted distributed ledger.