I never find anything positive towards gambling because gambling is just for time not for money making the machine. I never consider gambling is another source of income because the chances of making money are very difficult and sometimes addiction will also kill us on our expenses.
If you make survey in the world, you will find nobody saying that he has won lot of money in gambling and assumes it a good thing for making money. Gambling is not a business where you can make money. It is a way of losing money easily. Some people search for shortcut of making money and they choose gambling for solution which turns totally in vain.