Because Tickets Center probably did not have the tickets in hand when you purchased them. Tickets Center lists high prices for tickets and shows up on searches as the "Top sponsored" site to buy whatever tickets you are looking for. Once you fall for their scam, and purchase the tickets through Tickets Center, Tickets Center then goes off and buys the tickets at a fraction of the price you paid, and then they can provide those tickets to you a couple of days later. Since Tickets Center has a "absolutely no refunds policy" they take no risks with this strategy. Tickets Center is a complete scam.