It means quite a lot, but you can not extrapolate from it to other characters, and that's intentional - otherwise it would give away too much information.
But still a higher value means your are closer to the top and a low number means you are far away. And a number above, say, 90, means you are one of the best.
IMO that is very little as it being fame you should be able to know stuff a bit more specific when comparing to the rest the world but at the same time I understand not wanting it to be used for some things. I assume this means when people said whatever your fame is for a skill is your skill is actually not true then? Also perhaps so it actually fame, top 10's on some of things, and more explanation of the categories because some of them they don't really tell you what you are being ranked on, just a general thing.
