If you can work it out and place your position at the right place and at the right time, this statement is right, the chance of being compensated is very possible if you can predict the market and if you can place your position when the opportunity open up. And aside from that, the best practice is always not to follow greed or in most of the time, always follow your instinct. Maybe greed can be applied if you really anticipating higher chance of market pump.
It's more about your timing and how you understand every single corner of your chosen investment venue.
In any case, there must be a certain amount of luck to succeed. By the way, if you set yourself only small tasks, it is difficult to move on to big tasks. If trade is your only source of income, then small earnings will give you nothing. So you have to take risks.