Its because the owner/leader is a lazy bum, and switches to hop to another faction to do some construction or other activity that requires them to be in another faction. Then they change themselves back to being in leader after they are done. They just have no self-restraint, or ability to pass on duties to their members. THey are bad leaders.
That's an opinion, and not nessescarily a real answer.
That happens a good deal of the time sure. Other times are up to the faction in question. I know of a few who operate factions with varying degrees of trust, dependant on how they operate. Some switch every few days to give certain people equal power, in theory. And sometimes there's the kind of emergencies that require a leader to hop factions for a few minutes before returning.
It all depends on the people involved, really.
This user is currently in the process of moving, and so is semi-inactive.
Shuji, though some leader changes are for good reasons, those that switch between 2 or 3 people repeatedly over a period of a day or so are not doing it for those kind of reasons. Purely because of not wanting to wait etc.
I am not sure why you lot are arguing about subjective opinions in the first place. Whether you think someone is a good leader or a bad leader, effective or ineffective, that has no place in this forum. Simply say that the leader change notifications represent the leader switching factions to perform actions or duties elsewhere quickly before returning. This is a forum for help, not biases.