I'd suggest there's plenty of more prolific "MLM defenders" than I, Len Clements, Rod Cook, and Joe Rubino are three that come to mind, all active online and having published books. Then you have professional, independent, academics like Prof Charles King and Prof Dominque Xardel, and business historians like Wilbur Cross and Jim Robinson, all of whom have written several pro-MLM books, as well as journalists like Richard Poe, who has also written several pro-MLM books and numerous articles - to name just a few.
I'd suggest anyone who has written a few books on the topic is somewhat more "prolific" a defender than I am!