It's not from a revenue standpoint -- it's from a cost standpoint. Companies are leaving areas where their paid-out claims are the highest and trying to refocus their lines into places where they have lower risk and lower payouts...which, at the end of the day, is still just a profit margin matter. Can't make money if you're writing a bunch of costly policies. Shrink the red policies and go harder into black ones.
It just so happens that a large chunk of those bad policies happen to come from places more prone to severe natural disasters.