Friends, strangers, and my to-do list.
With my changing schedule it gets hard to find time for this game like I would like. In my infrequent playing, I believe that I have lost touch with some friends who I knew were on the verge of leaving one way or another. So the aspect of friends among those who I have befriended appears to change, or dwindle even. But playing with strangers is often fun as it adds to a different dynamic on occasion, and even a few surprises to see those same strangers again. And again. Without the notion of befriending them yet always getting along. Lastly, that to-do list is possible but just time consuming. So in some respects, I am grateful that I have never really been in a rush to gain anything too great here.
Guild and friends. I still enjoy SK but I've played the game out long enough to not have any remaining reason to continue being so active.