^ I am in favor of the suggestion above that Bustabit and Bustadice are the best gambling platform for investment and it will have a high ROI on it. I have been here in gambling discussion for how many years and as what I have observed most probably gambling platform that offers investment are dice gambling sites. Nevertheless, this thread will probably help you in looking for gambling sites that have an investment offered. https://bitcointalk.org/index.php?topic=2097255.0