I hope you have more information on this, because as of right now it looks very unprofessional. Stating that you're creating a back, using players money to invest into the stock market with no actual interest rate, investment rate etc.
I would need to see more before even considering this.
Also, do you have any actual evidence of your making profits from investing into the stock market? Like I don't need your word. I need actual evidence that I can see with my own eyes, Screenshots, documents, the amount invested and the amount gained etc etc.