$100 = 0.2840 Bitcoin.
I went on Primedice.com
This is the method that I was using.
Bet: 0.0001
Payout: 3
Every time you lose, increase your bet by x2.
Set the dice to over 66.6 & alternative after every few wins.
Be safe, and remember that there is no 100% way to win.
I lost half of it because I didn't realise that I started with 0.01 & lost after a few.
First of all, don't talk about $100 as an "investment".
You gambled and you got lucky.
There are no fool-proof strategies.