The game was the top grossing game in US around 1 hour ago.Obviosly not having precise data makes it hard to guess, but I think a good percentage of that number bought the game.Putting the fact with the game position in other countries, 20% is a good guess(that bought the game).
My (locked) thread about how difficulty should be a decision for the developers, not the gamers.
https://gamrconnect.vgchartz.com/thread.php?id=241866&page=1