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I agree it's a bit silly at present, where the vast majority of gold badges are Fanatics. Perhaps one day we'll be able to change the threshold, so it's really something to tease someone about.
@Wadim: those are tag badges, which are generated when somebody earns 400 (resp. 1000) upvotes within a given tag.
@Wadim: I think so too. But I suppose one could repeat Ryan's question at a deeper level, since indeed these topics do seem to get more than their fair share of attention on MO (not that I'm complaining).
I don't think it devalues the gold badges much. Consider that many gold badges will become much easier to earn when the site will have more regular visitors, as good questions or answers will get more upvotes and more views. The Fanatic badge, however, won't be easier to earn, ever.
As for your worry about employees finding out that you're visiting Mathoverflow much, this might happen, but I don't think the Fanatic badge alone changes this much.
@jdb: Your assumption is incorrect in at least one case. :)
Make it after a gazillion billion days in a row.
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