Is the idea that if a system really worked—by that I mean a combination of good profitability, low volatility, and durability—it wouldn’t make any monetary sense for someone to sell it? Occasionally, it might happen that somebody comes up with something really good and sells it because he needs the money. But in my experience, something good isn’t discovered on a Greyhound bus while leafing through the charts; it’s something developed over a period of years. Typically, if a person has invested sufficient time and money into developing a system, he or she will want to use the system, not sell
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