Interesting discussion.
We have had a similar problem. We also allow ex members to guest, this of course has downsides.
Banning ex-clanmates , specially high rank and as such supposedly respected ones does not really help, they can easily use other means of communication and it may even force a choice on to those who are their friends.
On the other hand, letting people just leave and guest kinda makes a clan an easy ' second choice' , back up date for the prom... When other clans demand absolute loyalty and they maybe offer something people want, like a permanent standing bosser army, it is so easy to just go to them and figure you can still get your ' fix' in the community department by guesting.
As such we have recently changed our rules and we ' ask' people that leave to stay away for at least 4 weeks. This cuts down on the drama and forces people to make a more clear choice.
Sidenote, we have, like all clans, had people leave, but a lot of these, maybe as many as 1/3rd have returned after figuring out they made the wrong choice.
22-Feb-2016 21:41:43