An MMO guild needs constant renewal. If you are not recruiting, you are dying. People unsubscribe all the time, so you are trying to keep a colander filled.
I am not all about the new recruits. I may not learn their names until they have been around a while; until proven otherwise, I assume that everyone is just passing through. I do not have the reserves to get emotionally invested in a series of people who are going back to X or just playing until Y comes out, whether or not they mention that. There is a self-fulfilling prophecy in expecting people to leave soon, but over the years I have invested a lot of attention and gold in people who did not always bother leaving the “this game just isn’t for me” note. I understand that many people are capable of taking an appropriate level of interest in an acquaintance, but I do not relish the hazy zone between “some guy” and “close friend.”
I prefer a small, tight-knit group. This is hard to maintain across games, jobs, families, time zones, to say nothing of across the years. This would be a major factor of my taking the year off MMOs.