Maybe we can catalog and tally the reasons people leave.
1. boredom
2. just wanted a change
3. guild master was not very good
4. conflict with other guildmates
5. too much drama
6. too much guild chat
7. wanted to join friend in another guild
8. liked the emphasis of another guild better
9. felt disrespected
10. decided I didn't like guilds in general
11. was getting asked for help and crowns too much
12. not enough active members
There's a dozen to start us off. Remember, this is not an opportunity to personally attack someone, but feel free to share your "horror story" if you have one,
Picking out of the Dirty Dozen:
Left my first because of inactivity.
Considering leaving my second for the same reason.