No'p! Within our guilds (SEE SIGNATURE BANNER) we shake off the inactieve players as seems fit. For Some reason everybody keeps coming on line...
Yeah, I dump people that have been inactive for 20 days. Soon after that, the guild fills back up again to max capacity until the next dumping period.
Personally we ask players that go on and off for few days at a time Every OTHER week to join our sister guilds. But keeping multiple guild brings other issues...