why? basically you're seeing a low trading envirioment , HFT'ing at it's finest! that's why any chance you get to book a profit on UVXY, you do. it's called take the money a run. because if you don't the HFT's will gladly take it for you. this is a interday trading vehicle. some time holding more than a few minutes or hours is the difference between profit/loss! these machines see all, know all. JMO G/L.