Which is the big one up north? I don't think ESPA has an ATIS, ESNN has but they're not that busy IIRC?
I'm just speculating now because I have no inside information on the ops of Swedish airports, but I would guess it's down to money. Most minor airports in Sweden can do just fine without an ATIS so there isn't the need to spend money installing one. That would be my guess on why there are so few.