What prevent the scalpers to create 100 nostr accounts, buy one ticket with each one of them, then resell the tickets with the resell option. Or even sell the nostr account private key that hold the ticket.

You could use some web of trust or enforce old enough account only but then you will just exclude every non-nostr users which will already be annoyed to create an account and a Bitcoin wallet and buy Bitcoin just to buy your ticket.

Great idea but there is still a lot to solve to make it usable at scale.