Isn't profitable long term, but could be fun, because there is much volatility and it takes some time.
Does Just-Dice provide a high frequency betting interface I didn't notice?
Any thoughts about a good exit-strategy?
After losing
582 simulated Bitcoin, the average number of bets was 156,764, the average longest bet run 27.24 and the average highest balance 6.26276818. The highest reached balance was 481.1572913...

My ruleset:
Chance to win = 0.3
Payout = 3
Initial Balance = 1.00000000
Initial Betsize = 0.00000001
If Balance < Initial Betsize:
Stop it, you're broke..
If Last Bet = Won:
Next Betsize = Max(Initial Betsize, Initial Betsize * Balance)
If Last Bet = Lost:
Next Betsize = Min(Balance, Betsize * 2)
I presume your "longest bet run" means longest sequence of consecutive loses. If so, I am a little bit concerned that out of all your attempts, your longest bet run is either 27 or 28. Seems a bit strange that regardless of balance at any point in time, it should remain more or less static.