While we are on the poker analogy (the non-gamblers amongst us must be getting sick of me now) I will just take a second to talk about sharks and fishes.
In poker, the sharks obviously are the good players and they spend their time eating the fishes, who are the weak players.
One of the key attributes a shark looks for when he is identifying his fishes is how often the potential fish bets early in the game. If a player bets a lot early in a hand of poker, they will be often betting on weak hands, because you can only be dealt strong hands so often.
If they are betting on weak hands early in the game, it means that they are more likely to be there for reasons that are not wholly focused on making money.
They could just be there for the entertainment, for the excitement, for the thrill. They don't want to fold on weak cards and wait until they have a strong hand to bet heavily on, because that's boring. They want to be involved, even if it is not the best strategy to win.
When a shark decides to take one of these fish on, he knows that they will bet, raise and re-raise probably regardless of what cards come out. Sometimes, the fish will get lucky when he goes all in on a pair of twos and he just manages to fluke a winning hand on the last card dealt. That is always a risk for the shark.
When that happens, the fish is delighted with himself and will brag to his poker chums about what a great player he is. The shark will give a wry smile, because he accepts that although he played his strategy perfectly, and was just taken out by the random fall of the cards. That's the nature of the game.
Does he give up poker, call the fish a cheat, or storm out? No, the wry smile is because he knows that it will not be long until the same fish tries the same strategy again and will blow up, because the odds are stacked against him over time. The fish will lose his account over the long term, because he is playing a losing strategy, and the shark will win over the long term, because he is patient enough to allow the odds to play out in his favour.
The analogies with trading are tremendous - I shouldn't have to spell them out. Don't be a fish, swimming around erratically, playing loose, taking stupid risks. Be the shark - patient, calculated and shrewd.
I would encourage you all to watch some poker on TV next time a tournament is on, even if you have no interest in playing. Watch, particularly at the beginning of the game when the table is full, how often the top players fold their hands. They fold far more often than they bet. When they do bet, they do so when the odds are in their favour. As long as the odds are in their favour, they are aggressive and inflict maximum pain on their opponents. Sometimes they win, sometimes they lose. But overall they will come out on top.