Wealth is could be earned by luck but it's not applicable to all people, so you would really need to earn it by working hard, being consistent, being knowledgeable and disciplined. So let's say that $50 dollar won't be enough for you to become wealthy to invest are you just gonna wait for your luck to achieve? People would literally take extra jobs or part time if you're a student just to have enough funds to invest. Well those examples you've mentioned might be needing a huge amount but little business would acttually a good start cause most successful person achieve it with experience. Luck and opportunity won't be siding on you if you can't even make an action to attain financial freedom.