The question of why the Bartlesville stations haven't moved into Tulsa is like asking why the remaining Enid stations haven't followed the likes of 96.9 and soon-to-be 99.7 in moving to Oklahoma City.
It's probably a couple of factors. One of which is that, in the case of KRIG, they can't. KREK in Bristow prevents 104.9 Nowata from moving into Tulsa. The AM's aren't likely to be upgradeable either. Another is that, in the case of KYFM, they can't move into Tulsa and be anything but a second-tier rimshot. KCXR 100.3 would prevent them from becoming a rimshot with a chance. The other reason you haven't seen Bartlesville stations move in is that they're doing okay where they are.
I agree with Grant that the Potters do very well with the Bartlesville stations. They're probably very happy being big fish in a small pond.