I answer your question with another question:
Why would you spend $1000+ on a CPU that was designed to be over clocked and not over clock it, when you could spend $300 on a i7 3770 with nearly identical performance?
I say nearly identical because, they are, until you start to push the processor. The beauty of the i7 extreme is that it will take punishment that the lower echelon i7s would blow up under.
The most efficient way to cool the extreme is by liquid. Its not cheap, but it works and works well. If you really want an air cooler get a noctua.