Quote from rcanfiel:
That is an unfounded statement. Even if someone has something that works, you cannot just assume he would never sell it to the public:
-- There are people who like to teach. Otherwise, no engineer would ever teach at a university. He would just go into industry and make a lot more $$$
-- Some people like to design systems, but are not interested in trading or may not have the stomach for trading. Someone can have an outperforming system, but not understand money management, etc.
-- Not everyone wants to put the throttle down all the way to become rich. They may not like the Risk of Ruin that is inevitable for most traders sometime in their career. Many people just want to keep their account sizes constant, and make a living from it.
-- Even for people who make good money from their system, providing signals for profit is a nice diversification in case of the inevitable drawdowns.
-- Revenue from a system has little risk, unlike the trading capital exposed by leveraged investments like S&P futures
If someone makes $300,000 a year trading, and $200,000 a year from a working system, tell me why they would never sell signals?
That being said, there are still few systems that work.