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This has been going on for days now. Highest I've seen is on third place. Even over Skyrim! It's been persistent within top ten for over a week, maybe more.
Rocket is surely making a lot of money for you. Seems like he is in for a promotion :P
But yeah. A sincere congratulations to you guys. It's about time more people recognized the wonder your game is. It's a great spark for your future release of ARMA III too. Highly deserved