I dont think that scalping is one of best ways how to make money on FX. Spread has far greater inpact on reasults then when you trade in a classical way.
Lets consider system using 6 pips PT and 15 pips SL. If there is no spread, you need any positive edge to make a profit. Now assume there is a spread of 2 pips. To make it even, you have to make two unprofitable trades and five profitables or make 5x 8 pips(6+2) and lose 2x 13 pips (15-2). To make a profit, your system has to have edge larger then 26,37%. If u traded with such an edge in larger timeframe where spread has lesser impact, your balance would grow pretty rapidly. But is u scalp, It just shield you from losing consistantly.
Lets consider system using 6 pips PT and 15 pips SL. If there is no spread, you need any positive edge to make a profit. Now assume there is a spread of 2 pips. To make it even, you have to make two unprofitable trades and five profitables or make 5x 8 pips(6+2) and lose 2x 13 pips (15-2). To make a profit, your system has to have edge larger then 26,37%. If u traded with such an edge in larger timeframe where spread has lesser impact, your balance would grow pretty rapidly. But is u scalp, It just shield you from losing consistantly.