Gambling and trading are two different concepts. Across the world, across ages making money quickly is considered gambling I will put it this way. Anything and everything you’re doing in the world is gambling one needs to understand the concept of probability pertaining to various jobs. But the fact remains, when one is gambling the odds are not in your favor. But when one takes a trade or invest, he is taking a decision based on the data he has at his disposal the best trader/investor are the ones who enter into position when the probability of success is high. The trader who do not analyze data before entering a position tend to lose money. Whereas its is the exact opposite when it come to gambling. Gambling is strictly base on luck even when the smaller odds are best possibility of winning.
  Casino games are designed to have a negative expected return. If you play games in a casino, then over time you should be expected to lose money. This is because the casino has set the odds so that you will lose money more often than you will make it. You are a customer paying them to experience risk. The stock market as a whole should have a positive expected value. If you passively hold onto a broad market index of stocks, you should make money over time. This is why the stock market exists- to give investors a positive return in exchange for taking on risk. In fact, in the stock market, the companies who issue stocks are basically the customers and they are paying you as an investor to take on risk. This is in contrast to the casinos. The fact that both of these institutions exist is kind of interesting. The stock market (like insurance) functions because people are, by and large, risk averse. Casinos function because, every now and then, people want to actually pay money (by losing it) so that they can experience risk.