You are right. There is no 7% sure of winning or gain in a gambling, people are lose most on it. Investment is a good idea of way to increasing a money. Though, there is nothing that do not has risk but at least if you have knowledge about you want to invest your money on definitely you will earn a good profits.I have always advised people not to go into gambling or betting or the likes because these things are addictions, people who gamble lose more than they gain and tend to run into huge loss and debts as time goes on. The best and right thing is to carefully invest the money or save.