Like many others we have run into here, I think Frank is honest and doesn't make much money from his web site which doesn't have that much traffic. Lewan the same, I doubt that Levi got rich off his work with Rossi.
But many Rossi proponents are immensely desirous and gullible. Many but not all lack the necessary science background, education and experience. That is how high tech and free energy scams succeed.