If you watch team fights from professional games, the majority of the action is not RNG based. Most kills are made off of hard CC, the kind of thing you can't RNG your way out of. The variation in gold reward per kill is not even noticeable.
Higher level players who are playing for prize money tend to prefer not to let their victory be a dice roll, either. Heroes such as PA and ogre who are completely reliant on their RNG are not highly favorable among competitive teams.