Do you think vega would be a big issue in a weekly trade?. .isn't just the gamma major culprit because you have to hedge the trade till the end. Is this kind of trade popular among other prop traders too?i would'nt say flies kill all the profit.. it does a good job in isolating vega so you only have to worry about other greeks since flies are vega neutral (generally). There is nothing more frustrating than getting things right such as direction, and magnitude only to see your $$$ leak due to vega.