Stocks? Bonds? Bitcoins?? Real Estate?
I would invest in a trusted Bitcoin casino's bankroll
It seems you're just promoting a certain site
Anyways, I also find investing on a casino's bankroll interesting and profitable but I can't find a reliable one so far 
but for investment some of what he say is a good option but it will depend on what OP like
for me bitcoin is the best option then while waiting for the price go higher try trading
invest in small amount in some site