I think a few providers, particularly with high fixed assets like venues, will always dominate in pricing power over many buyers (same for oil companies). The difference between oil and events is that they're elective (not a real need) and almost never substitutes (you don't go to one performer instead of another due to price). So providers really have the incentive to avoid competition (just as movies used to avoid coming out the same weekend). Altogether this drives towards provider coordination if not consolidation.
As others have pointed out, high prices and additional fees are just extracting higher prices, which is good for the providers financially.
The more interesting question is: since ticketmaster has a monopoly, why have price tickets at all?
The most efficient way to maximize price is the auction (assuming you can eliminate re-selling), particularly the dutch auction which reduces signaling.
With auctions, the performer takes no reputational hit for the outrageous price. Losing fans would have to blame the winning fans.
Also, you get a lot more information about the market, and could see softening demand or specific preferences (to, e.g., increase or decrease the luxury boxes).
That also tracks the winners/loser zeitgeist in the US, where people want to signal that they're in the 1%/10%.
My few concerts were real milestones in my life, but they were always the first shows of a great performer, relatively intimate and cheap (and always pure luck). I wish others could have that experience instead of the overpackaged hyper-produced events of today (required to support the high venue investments).