system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 Why is it so hard to overturn Ticketmaster's monopoly?
gpt
What Ticketmaster is doing is using their near -monopoly in one area to get a competitive advantage in another area. In many countries this would be considered an "unfair" advantage, particularly in the EU. 

Ticketmaster's parent company owns a huge number of concert venues. If a band wants to play in one of those venues they must use Ticketmaster to sell their tickets. Using a monopoly in one industry to gain a monopoly in another. 

As to why it's so hard to overturn, it's mostly because the political will just is not there. The merger of Ticketmaster with Live Nation should never have happened, and it could have been prevented by the competition/anti-trust authorities. Lots of monopolies have been broken up in the past in the US, most famously Standard Oil and AT&T. 

Perhaps the obvious solution is to simply have the venue owning part of the company spun off from the ticket selling part. Without owning venues, Ticketmaster has elss leverage to force artists to use it's ticket selling service, and competitors will be able to enter the market and hopefully drive down fees.