If you have trader traits, maintain them for as long as possible and remember to always think twice before doing.
I admire this tip of yours which could really help us to assess ourselves if we are doing good or not, I think I have also come with this kind of concept but the problem is not be able apply it.
a gambler however makes a trade but the result doesn't matter for him. if he wins he just becomes happy and if he loses he becomes sad. he doesn't waste any "brain power" to analyze what went wrong or right that led to the loss or profit. that is why not everyone becomes successful in trading...
Actually gamblers are spending more time spending their "brain power" to calculate the risks of their gamble. For example, poker players, they get the odds for a specific card and studied it if that card could have a better chances for winning. To make justice for yourself if you are losing, you must come with an idea to explain it for yourself, I think it also applies on trading, one man's gain is another man's loss.
I really believe hardly on this line which is indeed true on all aspect where things do involves money then this line suites them out. Either gambling or trading investments if someone earns then someone loss and the cycle would continue further on. Successful trader shouldn't really have that kind of personality where he do acts like a gambler, sometimes emotions would really drive you this into some circumstances that's why its important to handle out temper as you proceed.