Vengeance made over $ 400,000 in ticket sales from an attendance of 6,800 and received 320,000 pay-per-view buys , which helped WWE increase its pay-per-view revenue by $ 21.6 million compared to the year before . Vengeance grossed over $ 400,000 in ticket sales from an attendance of 6,800 and received 320,000 pay-per-view buys , which helped WWE increase its pay-per-view revenue by $ 21.6 million compared to the previous year .