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You also loooooooooove cool temps and 1C seems to matter to you, so I can see why you would do that!
Anyhoo......
Do people that put on after market coolers actually keep them in place or even keep the system for 7 or 8 years? there may be a few but my guess is most that work on their own systems don't even keep systems that old around or either would have no problem with taking the cooler off and reapplying new TIM when it needs it.
Not 7 or 8 years, but I had a couple of folding rigs that had the heatsink stay on for 2+ years without removal when I was using the Arctic Silver 3 and temps stayed well in line. I just had to periodically blow the dust bunnies out of the heatsink and case and set her back to folding.