It can happen by luck but not being sure they will win any time with it, if that was true how come a friend had been giving more than one bonuses but he had never use any of them to win. He just told you based on how the utility of his bonuses has been but doesn't mean all the people that have received bonuse got the same luck, a gambler can also say that for few weeks they never had any unsuccessful gambling and when a non gambler hear it they will think is general without knowing it was just how fortunate and lucky the person was that is why they met those wining.