Quote from tyrant:
But the put skew will only help in naked selling of puts and not when doing bull put spreads because you are long the lower ( further OTM ) put with higher IV and hence the put skew is working against you...no?
In an instrument like the SPX where the volatility curve is skewed on the put side rather than forming a smile, you will always get higher IV on the OTM puts vs same distance calls. When the IV is higher, the spread is priced higher. Doesnt matter that you have a long side, the price of the spread is still expanded due to the IV. The IV of the long strike isnt all that much higher than the IV of the short, atleast not enough to overwhelm the difference in deltas and equate the spread price to a comparable call spread.
Simply price a bull put spread 100 points OTM and a bear call spread 100 points OTM and you will see it clearer.
Now if ES fall in between your new Long ES Puts and the Shorts of your Credit Spread at expiration, you have a little lottery scenario