Exactly. This is not a food company. We're talking about a product (live event tickets) that is totally optional and which nobody has to buy. This should be the simplest "vote with your wallet" scenario ever. If everyone collectively stopped buying the tickets, they'd either be out of business or be forced to change their practices. People like their bands more than they dislike Ticketmaster, so TM is not going to voluntarily change.
Yeah and this is why I think this will amount to zero changes in ticket prices. People have demonstrated that they will pay. Venues sell out at the current prices. Why would they take less?