I made from 0.3 -> 5 BTC in 10 hours with martingale on PrimeDice.
It were so freakin crazy.. that "ride" raised my total wagered to 113 BTC.

Then I cashed out and lost it all back 3 weeks later..  

My highest bet were around 1.25 BTC.

Martingale is always a losing strategy in the long-run.. if you don't have unlimited money supply.