Prices are a lot lower.
https://www.google.com/search?q=working+louvered+shutters&source=univ&tbm=shop&tbo=u&sa=X&ved=0ahUKEwiH6M23p53KAhXIHh4KHdSqB3YQsxgIqQE&biw=1680&bih=935
But I do like the plexiglass PVC work.
I was thinking about the louvers on the shutters. You can still have airflow when they are shut.
But you are right. But you could keep them closed in the rainy seasons and still have ventilation. But then I don't know how great the price difference would be.