Am fully aware that bustadice offers investment opportunity for investors who wants more profit apart from participating in gambling. And I believe that there are a lot of gambling site out their that offers the same investment opportunity for investors.
Bustadice and Bustabit are one of the best gambling sites that I played. I also invest some of my money in Bustabit last year and got pretty much profit from it. I did not regret investing early in bustabit. 
Bustadice is very trusted site and i will also recommend this to everyone. Other than this i am not in favor of investing in any other gambling sites ( which may offer better ROI) as we never know if the site may scam once they reach good amount of investments.