The criticism of carbon steel in this thread makes me wonder how trappers and mountain men ever made it over the Continental Divide without their rifles and blades turning into crumbling lumps of orange-red iron oxide.
It's called maintenance folks, and it takes but a minute or two for knives and some thinking ahead for guns.
I live in western Oregon, which, if my perputal roof battle with moss is any indication, is as soggy as most anywhere inhabitable. I have two stainless locking folders and some SAKs, but the EDC is either an M2 or D2 blade from Benchmade, one of which is long since stripped of coating. My field knives are usually either a BRKT Gameskeeper, or a carbon Jarvenpaa puukko. These knives take a patina and then most concerns are over. I lightly smear the edge with a little olive oil so I can use these knives on food and I have never had a problem.
My hunting rifle is either a blue steel Remington with a wood stock or a Marlin .30-30 that go out no matter the weather.
It seems that wiping down the entire exposable surfaces of carbon steel with a Sentry cloth takes care of corrosion for the rifles. Stocks and forearm wood are removed in August and rubbed with wax to make them hydrophobic to prevent swelling.
Despite these precautions have I had some surface rust attacks over the years? Yep, it's inevitable because of human error if nothing else. However, any damage has been extremely cosmetic in nature and all of it easily corrected within moments of discovery.
One has to be extremely neglectful to let a carbon steel tool be compromised by corrosion. I guess those are the people whom the stainless market is aimed at.