Dante,
It's an emotional issue for me to move the stop to breakeven. Once I know that I won't lose money I'm far more likely to avoid tampering with my trades and it isn't good for your body to be under constant stress. So I consider my tactic an investment into my health. I do see what your saying that mathematically it would be better to put the stop beyond the next strong support or resistance but I don't have any valium you see
I make the majority of my living doing this and there's only so much fingernail-biting and hair-pulling I can do in a week. Also, if I hear "Your deal is confirmed" I'll go back in my office room and see if I can pick up the pair at a better price thereby increasing my profit potential. Riding bad trades never makes any sense. Why go negative when you can get out of the deal?
Also, would you not agree that a true breakout (with the majors) needs to exceed 20 pips beyond the resistance or support before being considered a real breakout? Any less and a pair might poke it's nose through before reversing and stop you out and anymore than that just adds to the loss. For instance, I find EUR/USD poking its nose through a r/s line by 10 or 15 pips all the time and then reversing in the direction I want. However, 20 or 25 pips beyond the r/s can cause gains/losses to accelerate quickly. So that's why I choose 30 ..
These last few weeks have not been an environment for big stop losses as well.. We keep seeing pairs blast through barriers at light speed.