tell me what's wrong with this analysis. 1. both VXX and XIV have a pretty pronounced theta on the 6 month+ horizon. 2. short them both to grab the value of the time decay 3. your main risk is that you are long gamma. if VXX/XIV are constantly mean reverting, no problem -- you grab that nickel; if the underlying VIX spikes hard you get margined out and you'll be steamroller fodder 4. in addition to this is the cost of the margin interest for keeping the shorts on am i looking at this the right way?