I don't agree that gambling can be used as a reference to measure someone's intelligence. Basically most gambling is based on luck, maybe we can do card analysis and counting but nothing is certain, it's all just probability and luck.
I also don't agree with this and don't think it's right to assume the way we gamble is the measure of how intelligent we are in life, gambling should be done with our personal best of interest, not because we are forced or required to do so, but because we have chosen to gamble and also have access to every entitlements that comes as benefits from being a gambler, luck and skills all works together to determine the expectation we have from it.