For those thinking about buying HNUHere is an actual (and fairly recent) example of contango and rebalancing...
I purchased some HNU @ $3.88 when the price of natural gas was $3.42. This was August 13th of this year.
Now that natural gas has once again reached that same price of $3.42, notice that HNU is not even close to the original $3.88 that I once had paid! In fact, it is about a dollar per share loss!!! Make sure you fully understand these types of effects and EXACTLY what particular futures' month HNU is tracking. Today being September 15th has NOTHING to do with HNU. The majority of HNU's tracking is based upon November. It will fully be November by the end of this Thursday.
Read all the posts on this blog for several weeks back before investing a penny. Save your money.