Who says Alliance has to go by what others have gone by? Why can't the alliance create it's own special things, especially when the game depends on it's players so much to keep it alive. You want to keep your dedicated players playing, they bring new people to the game and support chapters so they can continue to run. When these players get bored with their skills but have dedicated years into their character development, they don't want to just give that all up and start new.I can't think of any fantasy fiction where that has happened, can you?
Even to reference a popular game right now, World of Warcraft allows you to change race/class. They have learned that people will just quit when they get bored, changing something like this might renew their fun and love for the game, and more importantly continue to play and support the game.