You're right, I've ignored the elementals when they showed up. I helped kill a couple and didn't see any reward for the fight. But you could get killed. Maybe you get honor points or something but I've never paid attention to that either because I don't do battlegrounds.
See what a grumpy old man I am
Bah Humbug ..... oh wait that's for Christmas.
Maybe I should start a new main toon and call him Scrooge