The only media evangelist I have much knowledge of is Oral Roberts (I knew his daughter-in-law before she was his daughter-in-law.)

He had quite the money laundering scheme going on, from what I was told. He would write books and then give them away on his TV show. But unknown to the viewers, the "Oral Roberts Evangelistic Society" would buy the books from him (with donations from viewers) so that they could be "given away." He got very rich from that scheme.