This is when MM’s get absolutely hosed. I’ve really hurt some MM’s badly when I traded OTC energy. As a Commercial producer I had inside information.
Yup, theres definitely bad days, but its just about managing the variance in your P/L swings. If you make 5k a day 19 days of the month and lose 20k on the last day youre still up money. Whereas more long volatility type strategies lose 1k for 19 days of the month then make 30-40k on the last day. Still make similar money (assuming you know your edge) but exposing yourself to the occasional big hit not by default an unprofitable game.