Some people collect stamps. Others square dance. Still others sing barbershop. I do Toastmaster things. And I love it.
Toastmasters is for anyone who wants to improve their communication and leadership skills.
Not everyone wants to do that. My wife, a fluent speaker, would rather be shot than speak in front of a group of people. She likes to knit and be a mother. I've often wondered if there wasn't some level of minimum fluency that makes public speaking worthwhile. My initial reaction is yes, there is.