Reply to Hall of Fame for Top Users
having the leaderboard localised per forum makes sense also because admins can control leaderboard farming accounts easier by deleting their comments which then won't count.If the leaderboard is global, there is no way for admins to tell if what they are doing on other forums is legit, there is an attack vector where someone could create their own forum for only the purpose of self voting so they can get to the top of the leaderboard rankings.