It's a fair argument that Ticketmaster's monopoly position could lead to extortionary fees with small artists. This is unlikely to be a factor with larger artis

It's a fair argument that Ticketmaster's monopoly position could lead to extortionary fees with small artists. This is unlikely to be a factor with larger artists, and its wholly unrelated to the practice of dynamic pricing. A monopoly is not required to do dynamic pricing. Airlines have no problem using dynamic pricing on all of their tickets, regardless how competitive the route is. Every major ticket seller is going to dynamic price. If anything, Ticketmaster is consistently undercutting resellers like Gametime in my experience.