The WWE released their latest Key Performance Indicators through November 30, 2012. Data from the report indicates that the 2012 Survivor Series pay-per-view drew 212,000 buys. The event was headlined by Ryback vs. John Cena vs. CM Punk for the WWE Title.
In comparison, the 2011 Survivor Series pay-per-view featured The Rock teaming with John Cena and drew 281,000 buys. The 2010 Survivor Series pay-per-view featured Wade Barrett vs. Randy Orton for the WWE Title and did 244,000 buys.
You can view the full report (in .PDF format) at this link.