Trading doesn’t give us instant big profits. In fact, even if you trade with big capital, that will never guarantee a big profit as well. You might even suffer losses at firs, but that is only normal for beginner traders. Eventually when you developed your skills and working strategies, regardless of your amount of capital, you will surely make a positive trade.
Of course, trading never guarantees instant profits. Whatever our capital, we probably take times to take profits with good amount of money through trading. Although we use big funds, it doesn't increase the chance to get good profits if we still have lack of knowledge and experience. So, the profits will depend on how our knowledge and experience, it will be good when we can improve the knowledge and experience. We must understand that we will have effective strategies to use and have nice skills in trading when we have enough knowledge and experience.
Personally I don’t believe trading is for only the rich, definitely other people who aren’t rich but knows how to take a good calculated risk can also be rich through trading with time. I will recommend a good understanding of how trading works before anyone starts trading.
Trading is for everyone, but the capital depends on the economic level of each person. Trading isn't a must with big funds/capital, we can use whatever our capital. Even we can use $50 - $100 for the capital for trading. I think it is no problem to use small funds if we are still the beginners. We can gradually increase the amount of money if we can take profits continuously. Sure, it is not impossible to be rich through trading someday but it must take a lot of time and efforts. And don't forget to always keep learning, it is also the key to success in trading.