Well, it is hard to select how much percentage will be counted in gambling. Because i have seen few new gamblers who have earned more than oldest gamblers. Even i have seen oldest gamblers are mostly living poor life.
So for me, it is hard to count how much hard working will be counting, But it is, because we know about gambling from our experience and we get experience from our hard working.
If the new gamblers can earn more than the oldest gamblers, then it means he has good luck. That is true that some oldest gamblers had a poor living life. I think it's all about how to manage their winning money and what they're going to buy with that money. If they can not save the money and only making a party every night, then yes, he will get poor and all the money will be gone.