You must be in a coastal region then. Or I have to ask what are you doing?

I say that becuase except for kitchen knives, my SAKs and my mutlitools, all of mine are carbon steel. The only time I've seen rust problems was when one was stored (forgotten) for about 20 years in a leather sheath. So long as they are properly maintained, carbon steel out performs in everything other than a high salt environment. And I've never seen one "rust out", if you mean it is no longer functional, unless it was just abandoned and completely neglected.