Quote from Maverick74:
No, I would say that the gamma scalping offsets the decay from the front month options. Now I do believe you can even make a small profit if the stock is volatile enough on the gamma. But the purpose of the spread is to capture the short vega. After eps and FDA meetings and other big news events, the VOL tends to come in very hard and I mean implode. So I would scalp the gamma purely to be able to rent the short vega for free.
How often? I have tried scalping small increments and large increments and here is what I have discovered. I much rather actively trade a shorter range where at least I know I will capture most if not all of the theta rather then take a chance and be long or short a lot of deltas only to watch it vanish when the stock gaps the wrong way against you. I always try to play it safe. After all, I am making a pure vega bet here, not a delta bet.
In fact the one thing I would be really interested in here is if someone has written a program that will automatically trade the gamma for you based on statistical ranges. That way you can put these spreads on and not have to watch them all day because you have a program that is auto-trading them. Here is what my idea could be. The first hour of the day, it would be set to scalp the gamma of the average range the last 5 trading days. Take the range from the last 5 days and divide it by 2, that is the increment it will use the first hour of trading, then after the first hour, take a running count of the last 60 minutes range and divide by 2 and that way it will adjust to when the market is volatile, it will allow a greater range to scalp in and when the mkt is quiet it will tighten the scalping range. This way you could put on many spreads and be able to trade them all continuously at the same time or even not be at your computer at all. Let me know if you find such a program. I may have to create it myself.