In this day of on-line Kiwi-SDR's, what appears to be happening is stations go on-air as a test to hear themselves, to see if they are heard from Point "A" to Point "B", to hear upon how well they are doing so. There doesn't appear to be an interest to spend the time to announce some sort of ID, or any interests upon QSL INFO, but the times that UNID's are logged-in can be an indications to the op upon who else is hearing the station. For these ops, that appears to be just enough for them. Just, my take here.