The horizontal control of venues is only one issue. A perhaps bigger issue is the vertical integration (if that's the right term) of first-party ticket sales and resale in one company. Ticketmaster has no real incentive to try to prevent resellers from buying up all the tickets on first sale, because it gets to charge fees on all the resales through its platform. The more times a ticket is resold, the better. I don't…
Why not just ban the transfer of tickets and allow refunds? You buy a ticket, you show your ID at the door. Early refunded tickets get resold online and late refunds are sold at the venue. All seats, including the best seats, go to actual fans instead of scalpers just hoping to make a profit while providing zero value. First choice in seats goes to the most passionate and attentive fans.
Because everyone on the seller side - including artists - make money on this.
If parties other than fans / buyers cared, it would be a solved problem.