But consider for a moment the (possibly very small) possibility that he really has found an excellent way to make money.
Actually no, I will not consider that, like at all. ^ this does not exist on this planet. There is no "secret" way of making money with no risk, there is either legit based on sound fundamentals money making or there are frauds and scams. Every time someone discovers a new way to make money with such a high return it's almost always because they are the first to enter the market providing an actual good or service or they just discovered a significant technological advancement giving them a huge edge over the rest of the market, neither state of the market can last for a long period of time because competition soon follows and diminishes your slice of the market pie.
Please quote for me where he states he will continue this forever. Its you lovely people that keep making this estimations about what will happen "if things keep going the way they are".