I think mainly down to greed...How many US gamers do you think bought this game (i imagine quite a few) EAs gross profit last year dropped by 7% from $395milloin to $229 million. EA expect to be up by $100 million in 2008. (mmmm i would how???

) £180 per game.
Note to EA..if you dont want to lose money, stop bringing crap games out (Army of Two) and give your customers a bit more respect.