I'm curious because the main badges have a count associated with them (i.e., "altruist, 177 awarded"), but it's not apparent that you can find out how the number of times a tag badge has been awarded.
I've been active in the acoustics tag for rather a long time (and will keep chipping away at the bronze!) but it occurs to me that there are some tags that are a bit more esoteric. Obviously that means there are just fewer questions asked. But it also seems that they are less likely to be upvoted either due to unfamiliarity or disinterest within the community. (Hopefully this isn't too volatile to ask about, I'm simply curious.)