I refrain from using margin strategies. I have never seen anyone getting benefited from these.
Well, you can look at our accounts: 4-5 years of live. Our system really solid, but yes, any system has a 'bad day', that is why the main thing is MM and controlling of loss. FXStabilizer has a drawdown control system, that is why even with martingale, we will not lose all and always have enough if the margin for trading. You can see it at our accounts - stop losses. It's the worst situation that was happened on our accounts. But still, profitability and curve look very good for all the period.
P.S. I am just curious, who you saw successful from non-martingale systems with more successful monitoring then we have? I think it's not about martingale strategies, it's about good systems - it is this rarity.