One broker used bots to buy 30,000 "Hamilton" tickets over 20 months — vacuuming up as much as 40 percent of available seats for some performances — according to a lawsuit by Ticketmaster. During Bruce Springsteen's Broadway run, tickets with a $75 face value were selling for $1,400 on StubHub. Bot-reliant brokers have drawn the ire of pop star Taylor Swift, who vowed to foil them with a ticket-buying system aimed at rewarding the most active fans. And Chance the Rapper bought about 2,000 tickets from scalpers and sold them back to fans.