Ticketmaster and the major promoters have basically locked down the market, so they can set prices knowing you don't have a ton of alternatives. But the real killer is that secondary market markup - if you're buying through resale platforms, you're often paying what scalpers or bots grabbed them for initially, plus their cut. Those sites take a pretty chunky percentage too.
The underlying costs have genuinely gone up for venues though. Staffing, security, insurance, and venue rental itself all got more expensive. Artists' asking prices went up too. So there's real pressure from multiple angles, not just someone at a desk deciding to squeeze fans for extra cash. That said, none of that fully explains why a $75 ticket in 2022 is now $150 - some of it definitely is what the market will bear at this point.
Your best bet is hunting for tickets right when they first drop on the official venue site before resellers get their hands on them. Or catch smaller venues if that band has any local shows - the economics are different there and prices tend to be way more reasonable.