But with day trading you have the same problem you have with poker - there isn't any way to know if you're better than other people. Your advantage will be so

But with day trading you have the same problem you have with poker - there isn't any way to know if you're better than other people. Your advantage will be so small you can lose money month after month even if you've managed to tilt the odds in your favor. Worse, you can easily trick yourself into thinking you can make money on average after a prolonged lucky streak. In poker it's possible to be enough better than the competition that your advantage is obvious (to people who are similarly skilled, at least). I'm not sure that's the case with day trading.