Good idea, but there's atleast one problem: Which players will be counted into the country total? There's a lot of 2 week trial players coming and going not to mention people quitting and re-opening accounts with new handles. Therefore, the total amount of people having logged into a specific country the last time is much bigger than what the number of actual players is.
But if it showed the amount of players that have been in that specific country during the last week (or more accurately: have played in that country the last time they logged out), for example, you'd get a more precise number.
Camo