It DID work on down days. Look at the SPY and notice that 11-30 to 12-2 the market went down a bit and found support around EMA 20 and had a BULL FLAG forming JUST LIKE HOME DEPOT? That was the time to buy. I have said several times market may retrace a bit and looking to buy dips. Look at the charts of SPY and many other stocks see similar formations and patterns.
That's why I bought MU, MOS as mentioned in other threads. Not because I even know WTF these companies balance sheets look like. Who gives a shit? I only care what other people think about these. They could be selling air for all I care.