Yes, with emini contracts I scale in as it moves away from my price target, lowering/raising avg. cost basis. But like Bowgett says, I am prepared if it goes against me.
With this particular method, I am looking for small moves, and it ends up being a high probability win rate. However, when a trade goes against me, it is often more than a few single gains. It just happens at a low enough percentage rate to make the system work for me.
I agree with Bowgett though, got to be careful doing this. I go no where near what could be potentially very dangerous position size wise. Just little base hits, trying to get a lot of them.