I think it's interesting to try to identify his domain. I think it's marketing. He is exceptional at marketing, and at generating personal wealth from that. That is different from being a good businessman, or knowing how to run a business (and for his method of wealth generation, may by in opposition to it). I think he's very good a perpetuating his own extreme boom and bust cycles, and coasts along on that. While at the top, he's able to capitalize on the success to extend his brand,