I'd say that it has been pretty well proven that Jay Anson's book was a hoax. The motive, at least for the Lutzs, seems to have been to get out of the purchase of the house, which was financially ruinous for them. I've always found it odd that those money problems are so prominent in the book, and even in the famous movie based on the book. You'd think you'd want to downplay that angle in your ghost story.