Quote Originally Posted by Charlie Bernstein View Post
It's never seemed odd. I've always read it to mean, Thank you for all of your help.
But that would normally be said to a single person, right? I mean, it could be directed at a group of people, but to make it clear that you're talking to everyone, you might say Thank you all for your help, where all means 'everybody'.

Anyway, never mind. Like I said, my question has been answered and I see now that I was misreading the sentence for some reason.