Some scams might involve asking you to pay for a “training” book or CD that explains how to make money in a certain business. Others charge for supposedly “exclusive” products that you’re supposed to sell at a premium. Avoid both of these scenarios. Remember, you should never have to pay to get a job. And if someone asks you to, you can be sure that it’s a scam.
There are various ways to make money with games. Obviously, there's gambling, as poker, blackjack, and other games offer winnings -- though those winnings exist because of many other players' losings. A safer bet, if you're a dedicated gamer, is to try to get paid for play-testing new games. A little Googling might turn up some possibilities to investigate. At sites such as BoardGameGeek.com or VideoGameGeek.com, you could look up game designers and publishers to contact.
Regardless if you need to earn some fast cash or we're just talking about making money in the grand scheme of things, there's an important psychology that needs to be mentioned before getting into the strategies. If you study Freud's model of the mind, you'll discover the Psychic Apparatus. It's the three-part construct in your mind that controls all of your behavior.