I'm delighted that you like Maltz. I think he has been under-acknowledged very broadly. He made a significant contribution to the self-help revolution and a lot of what has followed in both that arena and in professional circles owes him some thanks. Perhaps his biggest crime was being an MD, and a mere surgeon at that. This probably didn't go down well with psychiatry and psychology so they try to ignore or belittle his work. Shame really, it's quite good.
There is plenty in psycho-cybernetics that can help traders get their acts together. It will come as no surprise that it will appeal most to the successful people, or those clearly on that path.