This strategy assumes that after 4 or 5 losing trades,your chance to win is bigger so you should add more money to recover your loss! The truth is that the odds are same in spite of your previous loss! If you have 5 losses in a row ,still your odds for 6th bet 50:50! The same fatal mistake can be made by some novice traders. For example,if a trader started with a a balance of 10,000$ and after 4 losing trades (each is 1,000$) his balance is 6000$. The trader will think that he has higher chances of winning the 5th trade then he will increase this size of his position 4 times to recover his loss. If he lose,his balance will be 2,000$!! He will never recover from 2,000$ to his starting balance 10,000$. A disciplined trader should never use such gambling method unless he wants to lose his money in a short time.