I don't think Dave wants to go and count every trophy earned. Figure out the ratios of people who have it. Calculate the rarity.
It's not as simple as having a "number" of trophies. You have to have access to the whole database that links every person's trophies and does all the calculations for "what trophies have not been earned by this amount of people," which Giant Bomb has to the 360, Steam, and WoW Achievements and Sony has yet to release to the public. Or maybe they just hate the PS3, oh well...
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