Firstly, at Tolstoy's times, there was no cinema. Or, to be more precise, the cinema that existed then already, he didn't consider as art. I think if he could find out that people in the XXth century would make movies like "Children of the Corn", he would turn over in his grave.

But okay, let's talk about his quote. Listen, do you think the boy wants to earn money when he narrates his story?
I even don't think that he wants to frighten the listeners. Well, maybe, sometimes, if he tells such a story to his friends, he does. But I don't think that's what Tolstoy meant, because when you tells a story just to frighten the listeners, you don't feel true fear yourself, and there is no complete sincerity in your story. What the Tolstoy's boy wants, is to share his adventure with others (not to frighten them), or to free himself from his fear, or the both. And he doesn't actually think what happens in hearts of the listeners. He's occupied with his own emotions, and that's right, that's when a true sincere story comes out. A boy would be sincere to the limit. His main goal is to share his experience, his emotions, his fear with others. If he narrates badly, not sincerely, you will feel falsity and will not be imbued with his story, you will not pity him. Even if the story is not true, he should tell it sincerely, and only in this case we'll believe him.

But when a director starts to shot a movie, it's not that simple. Do you really think a script writer always really wants to share with us his fear of some crazy man who deceives and murders people, and that's the true script writer's goal?
However, a film is always made by many people, and many people can't act, think, and respire like one person. It happens rarely even when the film is good. Only a genius director can make many people to act like one person and infect them all with a common idea.
The other main thing is that all those people who are making the movie earn money by doing that. I am sorry, but we can't compare all those people making their money with one boy who really simply wants to tell us a story, even if he only invented it.