You need to keep your emotions locked in a box when trading, but that doesn't mean that you achieve it by using laddering. It will lower your returns from successful trades as well as lower your losses from unsuccessful trades. We know that to be a good trader / investor your successful trades have to be higher than unsuccessful trades.

So, basically, you are lowering more upside potential if you are decent enough investor. Please practice something else for managing emotions while trading (e.g. meditation, quotes on the wall etc.), IMO using laddering for it will cost you lot of extra money.