I thought I had the rights to The Lord of the Rings. I don't know how Jackson ended up with the rights.
On the basis of the familiar experience that that which is learned with difficulty is better retained, it would have been safe to prophesy such an effect from the greater number of repetitions.
I think we all have a lot of darkness in our bellies. As an actor, the challenge of tapping into that, reaching down into that sadness or anger, is very therapeutic.