Talking about low risk vs high loss:
I lost 15 Bitcoin after losing my secondary password for my satoshidice account, admins won't help.
Thought it might be safe to invest along with a bankroll of 4,000 Bitcoin at the time but i was wrong.

That is so sad. Why would admin did not help you recover your password or your bitcoin? 15BTC is not a small amount. If you are a regular player, they should prioritize you. It is bad for them to lose a regular. Don't go back there, invest your coins on something that can earn you more and with admins that is accomodating when problems arise.