In a zero-sum game, others' losses are your potential gains. On the topic of giving advice to people on a public forum, if there is a method of trading that you believe does not work, why would you ever discourage others from continuing to use that method? If no one believed in charting, trends, backtesting etc, I think my life as a trader would be 10x harder than it already is. So how does it pay for one to try to convince people otherwise? Peer recognition? Moral obligation? Just curious.