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.
However, those who have good emotional control can usually take advantage of gambling. Gambling games usually play more on the emotions of the players, when we lose we become emotional and continue betting to win back the money we lost, or when we win we become emotional/greedy and want to win more by increasing the bet. In the end we will lose more money or lose the money we have won
So, I think gambling can determine a person's level of emotional control, not a person's level of intelligence
The gambler who want to buy the property they need to earn more money than other gamblers.So he should use his own strategy for the gambling game,then the gambler will not blame the gambling site for the loss.Mostly of the gamblers not going to praise the gambling site for their money winning in the gambling site.The gambler who control their emotion in the gambling site had more chances of winning in the gambling site.The gambler who win the game will not control the emotion after the win,So the most probable result will be the loss in the gambling site.Some gamblers had the unique style of playing the game,they easily handled the emotions after the win or loss in the gambling site.