Ticketmaster is not the promoter, even though they are owned by Live Nation. They deal with all the flack yet have nothing to do with prices. Live Nation is part of who sets the price, however; so is the artist, unless Live Nation is the sole promoter. It varies based on contractual agreements, etc. Generally, the artist is involved in setting ticket prices, or are at least aware and agrees to the price
Genesis booking that tour is roll of the dice. We go back to say, 50% capacity, and they are looking at rescheduling or figuring out which 50% gets to see the show and which does not.