I think your #'s are off.
Subtract business computers, then consider that the 0.01% of the remaining MIGHT think about it for 10 minutes, 90% who say no way. I personally know no one that would change out a fan.
The only "hard" data you wil find is publicly held Swiftech, there is a link to those #'s in a thread "Is Swiftech insolvent". Swiftech is one of the largest companies involved in water cooling.
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