From what I can tell, using Ticketmaster's dynamic pricing is a choice the artist can make (or the artist's company, or some business entity), and assuming the artist's contract is such that they get a percentage of ticket sales, the ticket price is the dynamically calculated price, so the artist does get more money for a dynamically priced seat.
If the artist chooses not to partner with ticketmaster, they will just buy the tickets at retail and scalp them. This is why you hear about so many shows selling out in the first five minutes. It's not real people buying them, it's ticketmaster bots.
