Quick profits is not that hard in trading but in gambling it is always hard. There is greater risk to lose more money in gambling than if you are trading. Though in trading it requires a high level of skill to do which is not required in gambling. In gambling you just need to roll the dice, and you're either poor or rich. That is so different from trading.
I think we can expect the quickest profit from gambling, that we cannot expect from trading or any other source. But for that you will bet high and therefore the risk of losing money will also be so much high.
You can get quick income from gambling if you are investing a great amount of money, that some time the greedy people do. But instead of making money they even lose their own invested money.