And if you run around telling people that you just bought some of the stock you think is going to the moon, is that supposed to make them less inclined to buy it, or do they now just think you're putting your money where your mouth is?
> what matters is what he expected to happen as a result of his posts on the message board.
Which is the problem. How do you prove what's inside of someone's head? Especially if they are malicious and know what not to say out loud.
> Someone who's genuinely predicting the stock market correctly isn't stupid.
If you think the stock is going up 1000% and it only goes up 300%, you were wrong, and your pick was wrong, and the people waiting for it to go up 1000% before selling are the people who lost money when it went back down. But as far as I know, being initially wrong and then changing your mind before you lose your money isn't illegal.