I think you guys are over complicating the why's here. The biggest enthusiasts are the Govt, the military and financial institutions. Solder does not do well under liquid nitrogen, there were problems with Sandy Bridge and LN2. And you really can't get the IPC gains from gen to gen until you do extreme OC.
. - it is in production, it is juvenile to think in the age of computing that anyone cares to save money on thermal paste, the stakes are way higher than frame rates in video games EG Snowden/NSA, hello.
Funny that the conspiracy theorists were on to something, though through lack of being on the leading edge of computing probably didn't realize a more innocuous use of LN2 http://www.network54.com/Forum/291677/thread/1230840274/OT-+Why+would+the+Defense+Logistics+Agency+buy+liquid+nitrogen-