Quote from opt789:
First of all it is not a once in 80 year occurrence, not even close.
Second, the one that does you in is the one that hasnât happened before and cannot be predicted. I can think of a whole host of occurrences that if they happened to transpire would result in a 20% gap down and a triple digit VIX. The gap is what will hurt these type of traders, not a big move that happens over the course of a few days. If that were to happen margin requirements could be raised significantly and naked option writers would be done. These guys would lose everything and be shut down, that is simply a fact that is indisputable. The only question is if/when the big scary gap down happens.