DislikedYes i know that method too. I tried it on a online roulette game with play money. Its like the same 1$ on black if you win then 1$ on red if you lose double it if you lose again double it again... If you get for example a lose streak of reds you will risking in my example 150$ for 2$ that is crazy xD
I think with this method a margin call is guaranteedIgnored
http://en.wikipedia.org/wiki/Martingale_(betting_system)