The value-add of the aggregator, compared to TicketMonopolist, would be finding tickets in the cases where they’re available at one of the competitors. The aggregator would charge either a nominal fee or even zero fee when the customer ends up buying tickets that come from TicketMonopolist. Either there’s an upfront or subscription cost for using the aggregator, or they can charge a fee specifically on the non-Monopolist tickets.
(I assume part of the picture is that customers find it highly inconvenient to go to more than one place to find their tickets—otherwise TicketMonopolist couldn’t charge much of a premium, hosts would just use the competitors and the customers would find them there.)
The value-add of the aggregator, compared to TicketMonopolist, would be finding tickets in the cases where they’re available at one of the competitors. The aggregator would charge either a nominal fee or even zero fee when the customer ends up buying tickets that come from TicketMonopolist. Either there’s an upfront or subscription cost for using the aggregator, or they can charge a fee specifically on the non-Monopolist tickets.
(I assume part of the picture is that customers find it highly inconvenient to go to more than one place to find their tickets—otherwise TicketMonopolist couldn’t charge much of a premium, hosts would just use the competitors and the customers would find them there.)