What was the cost benefit analysis of winterizing for a once-in-30 years event? Isn't this exactly what is missing? Is it worth paying 10% extra (for example)

What was the cost benefit analysis of winterizing for a once-in-30 years event? Isn't this exactly what is missing? Is it worth paying 10% extra (for example) for electricity forever, in return for having 3 extra days of electricity for a few days in 2021 and 2051? It might well be, yes.