This often happens during a mean reversion move in strip vols or shifts in the term structure. Any further info you may wanna share on the subject would be appreciated.
Shhhh.. dont tell anybody....oh wait in my jubilance from yesterdays raking in of the cash I let the cat out of the bag. Darn it...everybody forget what I said..the SPX options are a suckers game. The CBOE MM`s are crooks...CROOKS I SAY!!! Play the SPY and ES if you follow the SPX. The spreads are tight and you will have plenty of company so you dont feel lonely.