You get your first ticket as a part of the gift hamper you receive when you earn your first billion through honest hard work and never taking a sick day in your life. Each subsequent ticket is gained through deals shifting help desk call centres to India, The Phillipines or China.
Obviously, the tickets are very sort after but on-selling them is only legal if you list them as “TICKET FOR TAYLOR SWIFT CONCERT!! Serious offers only!!! #swifty #taytay”.