I've been watching with interest what Deprived has accomplished with the DMS set of funds. This particular form of structure is a good idea and could be replicated to create a wide range of potentially useful products. In particular there is an obvious need for a "volatility swap-type-product" which merchants could use as a hedge against extreme movements during lengthy conversion to and from fiat. Another nice effect is that the paired nature of the funds effectively remove the large bid-ask spread observable in the highly illiquid markets for bitcoin derivatives. A call-put type fund modelled in DMS could also be envisioned.