That's just been my experience Keith. I've had ATS34, AUS-8 (beadblasted mind you), G2, and S30v rust on a humid day at work. Not just dusty rust either, any rust covered a tiny- medium sized pit in the steel. While I don't pocket carry my infi I also don't baby it after use, they usually get used, then either cleaned or (more often) put away dirty until I need to use them again. Any rust that I've found was wiped off rather easily with a finger and only left a dark grey patina underneath. I suppose there should be a fair test, expect an infi vs ats34 "stuck in the open bed of my truck for a few days to see how they rust" test soon".
I'm wondering if hot blue would work actually, but while there's been some discussion about it I don't think anyone's stuffed it in a blueing tank yet.