True...OC'ers have been doing this for years. What's also been happening for years is the systems leak and coolant+cpu+electricity=BANG! (expensive fixes) :-)... I still don't think they've really come up with a truly leak proof liquid cooling system yet...
Four years no leaks on my old vapo...abused to the max. Condensation would be more of a problem.
This is a refrigerant system...if it leaks then the "liquid" evaporates...