Just before Rage of the Firelands (Patch 4.2) came to us, there was a lot of speculation about Volatile Fire and assumptions that people would be paying heavy for it on the Auction House once 4.2 actually released.
True story. I made a thousand or two (I didn't try especially hard) selling it.
Once daily quests in Mt. Hyjal and Firelands started up, Volatile Fire started to come easy. I assumed that the prices for it would drop dramatically, perhaps all the way down to "free with a cup of soup."
But, no! You can still get a fairly good price for them.
As a bonus, the places where you can fish it up are uncommonly available for fishing. Probably because everyone is in the Firelands kicking ass.
Moral of the story: Keep trying to get extra Volatile Fires. The prices are still higher than you'd think they should be by now.