I used x before it was popular.
Tag badges are created by the system when the first user reaches the bronze level for that particular tag. Why not give a "hipster" badge to the person that caused it to be created? Honestly, I think the very first person to hit a milestone in any given tag should have something to show for it.
The point of this is to incentivize people to answer questions in low-traffic tags. I don't see any badges that cover this. Josh Caswell mentioned Tenacious and Unsung Hero, but I thought those were meant to encourage helping new users who can't upvote, but can still accept.
Of course, comment/criticize away...