^Martingale is something you do for quick short periods and stop and not continue forever, you could try to martingale way your into the bank but you are going to get bankrupted before any of that happens. Obviously you could lose your first 10 bets in a row and never win anything and only lose, however that is not that much common (even though quite possible) which means you could potentially 2x your profit and stop there.
If you could just open your gambling account every day, put 10 bucks, double it, stop and repeat this every day, if you lose that 10 dollars you stop, you could do this 20 or so times a month, and lose 10 or so times a month, meaning you would make 200 dollars profit. This is the idea where professional martingale players do. At 15/15 you break even, and anything above you get a profit, anything under you lose. Never continue forever, stop when you lose base or win double.
Without martingale (which is an aggressive approach when you double/triple your bets after losing one/two or more bets) I think we can't make profit! It's some basic, over time you need to rise your bets if you wish to make some big wins, or at least to rise odds, it's one or other!
I tried with some bankroll strategies, to make 10-20% every day, to make double from a specific amount... all that gone to air, maybe I didn't have patience, or good strategy... who knows, but I am still trying, that's what counts I guess!