I wanted to suggest Primedice because it is the most trustworthy dice site at the moment, but according to
http://dicesites.com/ they have
no invest option. Tha's strange IMO. How this can be that you don't need investors? I thought it works this way: the more investors you have the better.
Maybe I'm missing something in understanding economy.
They don't need investors. They got in early in the game so already have enough coins not to mention the huge amount of coins they have won from gamblers so why would they want to give any of their profits away. Investing in dice sites is risky because new ones that pop up can easily just run off with the entire bankroll. I'd look at other ways of investing your money or just keeping it for yourself.