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The Party graph would seem to indicate that the US sites should have a flatter/extended peak, while the non-US should have a pointier peak; would be nice to confirm that all the sites follow this same pattern.
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Well, here's a graph I was thinking of posting anyway. It shows that PokerStars has a mixture of American and European players, although I'd guess Europeans are outnumbered maybe 2 or 3 to 1. Stars doesn't have the kind of cross-contintental balance that Party had before the Frist of October.
On the other hand, FTP and Bodog have very little European component to their curve. It's pretty much all North America. Even Party has a broader peak than they do, which is kind of mind-boggling.