Concert tickets _are_ dynamically priced, at least for some events. See Ticketmaster's "Official Platinum"[0] which is a dynamic pricing system for the best seats, I imagine other companies have something similar.
As I recall from my economics, one of the usual theories is that bands/venues/sports events/service stations in remote locations/etc. don't in the main want to gain the reputation for being the a*holes who will rip you off given the slightest opportunity.
It's at least possibly bad for long-tern business. And in the case of small businesses, the owners may just not want to be that person.
For events, "list prices" are often gotten around by (in addition to ticket brokers being a thing) by various types of VIP seating, extras, and so forth which raise prices to closer to market levels while leaving normal ticket list prices--assuming you can get one.
[0]: https://help.ticketmaster.com/s/article/What-are-Official-Pl...