If you are particularly extreme about your collection, you need to invest money in protecting it.
I have always felt this way.
When I first started to collect rare and vintage comic books in my teenage years, I always tested them. I sealed them in bags, using cardboard backing so they would never get bent. I kept my entire collection in boxes, and stored them in a safe stadium away from moisture and sunlight. I still do all of those things, except now my collection consists of fifty thoUSAnd comics! I considered paying for a weather conditions controlled storage locker, however instead I decided to build my own collection room at home, with its own dedicated HVAC system. This was not a cheap thing to have done, however compared to the price of renting a weather conditions controlled storage locker for several years, it was sufficient. I needed a dedicated HVAC system for the collection room, as well as additional insulation in the walls and blackout shades for the window. I didn’t need to make the room as cold as a freezer by any means, although I needed reliable and consistent weather conditions control settings that would never change no matter what. There is an ideal level of temp and humidity for comic books, and I got that locked in! The only possible problem I have is a long-term power blackout for the section would shut down this HVAC system. In case that happens I have a small power generator in the storage shed, which I can hook up to the HVAC system in case of emergencies.