There are other means to make money but Surely when classifying types of wealth I don't think gambling or bet can be classified to such category. We invest in other physical asset that generate income and some small percentage from it can be used try out by gambling. After knowing fully that gambling wins are not guaranteed, some persons don't even win at all within a year then why having such mentality of making money through gambling, or is it that their is a certain phenomenon  attracting people to gambling that is difficult to understand aside from the entertainment aspect of gambling, because it's really funny to see most people nowadays gambling for money and not for the entertainment aspect even if we have little mindset of winning some day.