Quote from optionbull:
Basically works in theory until it does not, at which time it may lose massive ?
Correct.
Now she has 2 things going for her. One that she sells both sides (instead of just puts), second she does only half of the account or less first, so she has more gunpowder left in a bigger move....
On the other hand selling calls can backfire too, so it also increases risk. In January the market went up 7%, that is quite a big move, I am sure they had to keep adjusting like crazy...
