I'm torn on this one. First, in general I take your stance on a lot of things regarding price. If it's not essential, and I use a broad brush to define essential, it's business and prices are prices. But, sometimes, there are exceptions and I think Ticketmaster is one of them and this is why. They didn't get here because they innovated or provided unique value they got here because they were playing exclusionary games targeting competitors and buying them out all while building extensive exclusive agreements that effectively lock out any real competition. Venues and artists have said we refuse this and we won't use it and Ticketmaster just crushes them. They can't use exclusive venues. Venues that do let them in will get banned from any future Ticketmaster event. And when Live nation and Ticketmaster merged they pretty much got between 70-95% control of every layer in the live entertainment stack. Multiple horizontal and a vertical monopoly.
Now, that being said. As much as the artists claim to hate Ticketmaster and they're as much of victim as anyone else Ticketmaster does provide bad guy as a service for them and that's where a good chunk of ticket fees go. The artists in order to give the appearance of fan friendly prices will take a chunk of the fees as a venue or event bonus. The artists get their fill but don't look bad and Ticketmaster takes a little something something extra for their trouble.