Quote from blueberrycake:
Think about it this way, it's extremely rare to buy the bid/sell the ask in ES without the price ticking through to the next level.
Hence in order to hit your target of .25, the price actually needs to move .5 in your direction. But to get stopped out at .75, the price only needs to tick down by .5.
So if are long, and the price moves up by .5 you make .25, but if it moves down by .5 (the exact same amount), you lose .75 or three times as much. In this setup you have to be right 75% of the time to break even before commissions. Good luck!
-bbc