I had neighbors who were very wealthy when I was growing up.
They made some religious based NFP, then would find really old wealthy people, who would put the NFP in their will and die soon after. They had a private dock on the river with a small houseboat and jet skis, a huge house with an indoor pool and skating rink, and a small elevator despite the house only being 3 stories, and a massive gun collection.
The father, presumably the mastermind behind the scheme, got cancer that killed him very quickly. After that, the family left and I have not heard about them since.