It used to be I could visit a friend who had Snatchins and banish them until my heart content and they would just keep respawning. I really loved the stuck mobs before they fixed that bug. Now when you banish a mob at a Friend's manor, the mob does not respawn, so after banishing 15 mobs, the friend's manor will be empty. You have to go next door, then return to respawn the 15 mobs again.
Similarly, there are 15 mobs around your manor. When you banish a mob around your manor a random mob respawns, not the same as the one you banished. This is different than it used to be when you banished a Tripod, a Tripod would respawn. Now if you banish a Tripod, a robot may respawn in its place.
So the secret to getting a good group of mobs around your manor is to only banish bad mobs. Do not banish Tripods, as they will disappear and be replaced by something possibly much worse. Do banish your Robots and Snatchins and hope that they are replaced by a better mob.
So in general, do not banish any good mobs around your manor, go to a friend's manor to do your banishing. If you banish good mobs around your manor, you will end up with all robots, which helps nobody.
Another good rule of thumb, save all your oil cans for banishing robots around your manor. Do not banish robots around friend's manors, as they will just respawn anyway.
NOTE: This does not seem to work for all manors. If you have a quest ongoing, that may effect your respawn it seems. I have completed all quests and kill acheivements except robots.
Mobs currently around my manor:
Joe the Farmer x3
Little Green Men x3
Last edited by DonTheBrute on Tue Oct 09, 2012 8:32 pm; edited 1 time in total