In Weed’s case, the profession was hardly suitable, but his Leadership and Charisma was on the very high side. But to be at the tolerable level of a guild master, Weed’s Leadership and Charisma weren’t enough.
On top of those, while Weed hunted, part of his hunting EXP also went into Tori’s growth.
In other words, Weed’s contribution to Tori was very high, which forced him to comply.