Out of genuine curiosity, what's the advantage from your point of view, other than being able to communicate to other people who use the same system, at the cost of not being understood by everyone else?

(What I heard in the UK during the supermarket transition to metric a decade ago: imperial uses fractions, which is a useful to grasp for learning children, etc. But I'm surely misquoting so don't worry about this argument)

I am asking because I only come across the imperial system when watching Mythbusters or reading a book about the Space Shuttle, or someone tells me their weight in stones, which always leaves me rather puzzled.

This is just out of curiosity, I'm not trying to work anyone up.