Rent-seeking is not merely pricing your product as high as the market will bear.

Ticketmaster adds value. They just charge exorbitant fees.

...

Edit: But OK, you can argue that their full vertical integration (ticketing-venue-artist management) is maximizing their position for the furtherance of increasing their fees, and that would be rent-seeking. I don't see it that way, but I won't argue against interpreting them as a coercive monopolist, which is close enough.