I was recently wondering if I could save battery life on my quartz watches by pulling the crowns out when not in use, but I'm too worried about moisture getting in.
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Moisture isn’t your biggest issue. Most crowns have caskets that stay located in the crown tube. Only diving watches might have a second which engages when the crown is screwed in. A bigger issue is prolonging battery life artificially and then for the non lithium cells, frying your circuit with an acid leak.
That’s not a thing. A pulled out crown can let in humidity and cause serious damage if bumped or dropped, as it’s fragile when pulled out.
Pulled out crowns do not let in humidity. The gasket stays seated in the crown tube for even the most basic watches. Divers might have a second that is engaged when the crown is screwed in. But I have no idea where you live that the relative humidity in the air is of great enough concern in the first place. Do you keep your watches in a box of water?