David Cronenberg was interviewed by Voici (France) and had this to say when questioned about casting Rob in his last 2 films:

“Why did you choose Robert Pattinson for your last two movies? Did his presence as a star help fund them?
Damn, I came across a fan! (Laughs) I know it sounds surprising, but I hired him because he is very convincing, both in the softness and hardness.”

Thanks @sallyvg for the heads up.

Translated with Google Translate