I read a past research and they conclude that only few percentage of investor are consistently making money and majority of the investors keep losing their money because of lack of knowledge. It is the number 1 reason why investing doesn't guarantee you to be rich.
In addition to knowledge consistency is needed in investing, while success or failure depends on how a person plans the investment he is making. Investment requires money as the main requirement to run it, if you have a little capital to start then the profit will follow the adjustment of the capital, whether you become rich or not depends on how much money you use to invest.
Talking about investment reality will bring you to the stage of wealth if you have large capital and you know the right moment to buy. Profits will be proportional to the capital you have and the greater the capital you place, the greater the profit you will get, that is the actual investment formula logically and in reality.
That is if you are investing with skills and high knowledge. Otherwise, large capital does not guarantee big profits at all since investing without preparation will only waste your money and efforts.