Gambling

I strongly advise you NOT to Gamble. Although you can make tons of money out of this, and you'll see players brag about the millions they're making, it's a very very risky thing to invest your money in.
You make money and you lose money: When you make money you want more, and end up losing. When you lose money, you end up wanting to get it back and lose more money. That's how Casinos work.

Don't gamble. Spend your money on bullets for yourself, and not for the casino owners!