Ack. I'm not going to pretend like I've thought up the whole business plan, but it's well known the centralized ticket agencies have huge markups. Ticketmaster's ticketing business is something like $3B in revenue with $1B in profit.
I'm sure there's still a need venue services, I didn't mean to suggest the venue could or want to be entirely in-house. Maybe I'm minimizing that part of their business, but if tickets are NFTs it's so much easier to avoid vendor lock-in for expensive scanners and day-of services.
A database indexing scanned tickets is cheap if you don't want to burn/transfer the NFT at the door (depends on the network costs too). But again maybe I'm trivializing what Ticketmaster does (IMO I don't think I am).