In all your definition of regular gambler vs professional gambler, it seems all are right and I don't know which one amonge all I will disagree with according to your request. But I will just say that regular gamblers who gamble on regular occasion wether they win or not but they just keep trying and hoping to win big someday. This regular gamblers are highly provocative at any misconception due to much loses. While the professional Gambler looks like they take gambling as business, even though there is no guarantee that they will continue to be making profit from it as expected. The truth is that the end point between the two are just loses because there is always a possibility of loses than win no matter the skill difference.