Quote from ryank:
The probability of a short call going in the money doesn't necessarily increase because of a bull market. The probability of a short call with a delta of .10 has a roughly 10% chance of being in the money. This is true at the time your order is placed. Obviously this changes over time as we head towards expiration, the market moves and volatility changes. I think right now we are experiencing more of a "fat tail" type event in a sense over the last few months which has caught people (me included) that place trades 1-2SD out.
What I meant is that the delta (due to the low VIX) is not reflecting the acutal chance due to the relentless push higher by the markets.
Yes, it looks like the "fat tail" so far - just look at the Nasdaq chart from April till now. Extreme volatility - "V" reversal off the bottom. But the SPX seems only slightly better.