+1Funny, I never thought about it, but I noticed this weekend, I consistently loosen the clutch every time I walk away from the kit. As well as flip the snares off.
I think I just started doing this back when I was a kid because I saw show drummers do this to eliminate any noises when there wasn't music being played. Still makes sense to me today.
My clutch (same 70s stand) failed last week. Its 2 pieces separated. The threaded part is splined at the top and presses into the bottom of the top part. The splines wore out and no longer hold. I hammered it back together with a bread tie in the splines. So far so good.I think the wear and tear on the clutch would be worse than on the hi-hat spring. I would be more concerned about wearing out the threads on the wingnut, honestly.