WWE’s Vengeance pay-per-view event on October 23, 2011 garnered 130,000 buys overall—70,000 in North America and 60,000 overseas.
With the exception of the disastrous December to Dismember pay-per-view event in 2006, Vengeance is the lowest-selling domestic pay-per-view event in WWE history—dating back to the infancy of pay-per-view in the 1980s.
December to Dismember, which was technically branded as an ECW event, drew 55,000 buys in North America.
Vengeance was headlined by Alberto Del Rio vs. John Cena in a Last Man Standing Match, Mark Henry vs. Big Show in a World Heavyweight Championship Match, and Awesome Truth vs. CM Punk and Triple H.
(source: Wrestling Observer Newsletter)