It is funny that everyone here was so upset about the Madoff's ponzi scheme but when they see another ponzi developing in front of their eyes they just don't care much.
be careful trading a security based on another (e.g. vix future based on vix). true story - one time (no not at band camp) i was long uup calls and there was a temp shortage of units for the etf which caused a price spike and i was able to make 60% even though the DXY which is what it's based on didn't move. soon after the shortage of units was resolved like the next day the price of uup collapsed.
point is these types of moves can help or hurt you but be on the safe side and always ask how they can hurt you.