why don't you try investing on the bankroll of an online casino?. i have tried invetsing in an online casino and that time is yolodice. Just make sure you are investing on a legit casino or gambling site.
I don't think it's a safe way to make stable earnings.
When you invest in a casino bankroll, you still rely on the luck. Not yours but from other players (or rather, their lack of luck). What do you think will happen to your investment if a high-roller player gets lucky? See investment statistics at YOLOdice for the LTC market.