Making a film is so hard that if you don't have your main actors going along with the ride with the rest of the crew it can make your life very difficult.
Are you genuine? Or just an actor? A representative? Or what it is that is represented?-In the end, you might merely be someone mimicking an actor ... Second question of conscience.
When I was a younger actor, I would try to keep it serious all day. But I have found, later on, that the lighter I am about things when I'm going to do a big scene that's dramatic and takes a lot out of you, the better off I am when I come to it.