But there IS an "end game" for advies.
To become a noble.
Not all players decide to progress their advies to this last step, but it is an "end game" that is entirely possible.
I currently play two nobles that started their careers as advies. (with another advy ready to step up when I feel the need to replace one of my nobles)
From a commoner to a KING.
Now that is a well played character and a story to be told.