Is it ok to make financial investments?

Thank you for the replies to my last question. Now I want add a question that I have been thinking about for the last few months.

Is it ok to make financial investments and let the money "work" for you. Let's say you buy stocks and their value increases by 20% after a year, so your investment basically multiplied by 1.2 whiteout having done any work for it. Is such a system even fair because you ve put no work into it except that one time investment? The thing about the money system is that it artificially creates unfair distribution (if people knew their work is used to enrich the billionaires they would be outraged) and as the Course teaches it can't be real because it contradicts the law of God that gain is impossible if someone loses. But those that know how money works can make more money while working less...and the average worker works their you know what off. How can this system be fair? and how can honest people become wealthy if it means another has to lose for them to be rich?

If I invest in a unfair system like money which has nothing to do with equality, doesn't that mean that I invest in an illusion and therefore strengthen the idea in my mind?