http://money.cnn.com/2015/08/24/investing/stocks-markets-selloff-circuit-breakers-1200-times/
The whistleblowers state that much of the ETP's "asset base" consists of synthetic/derivative positions ... They're just words on paper with no assessment of the counterparties ability to cover...
YES , I too would like to short these beasts but as they are SEC protected wall street fraud vehicles I'd always be afraid of manipulation ... I personally suspect that his is how wall street creates fictional shares of companies so that they can pretend that they are shorting borrowed shares instead of admitting that they are completely naked (an illegal market manipulating practice that the SEC has NEVER INVESTIGATED OR ENFORCED).
Frankly, Wall Street is a mess and the intermingling of our government executives with the big firms and the Federal Reserve has brought crony capitalism to it’s pinnacle in America.
It’s not capitalism when the game is rigged.