i get the feeling that official fansite fancammers work directly with sm management (isn't that what shipcaptain confirmed when she talked to h4lo)? that's how they know to be at the airport and that's why sometimes they don't know to be at the airport (yulsic in gimpo, taeny to 0rlando). i'm guessing sassaeng do their stalking the old fashioned way. and when you're a fancammer and you follow the girls as much as they do, you can easily distinguish who's photographing for a fansite and who's keeping the pictures for themselves
anyway i don't think it has to do with being outside the sm building, we've had plenty of pictures of the girls entering and leaving the building before and it's never been an issue before