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Why the volume disparity between NUGT and DUST?
NUGT and DUST both track GDX with triple leverage, but in opposite directions. GDX has been rising steadily throughout 2016, and certainly since over the last month. DUST experiences much higher volume when GDX is in a downward trend, as it was from 2013-2016. I think you'll see the same thing with DRIP and GUSH when oil has been moving steadily in one direction or the other. This is really a reflection of the herd mentality to jump in when things look like they're going a particular direction.