This surprises me...
I have to admit this surprises me as your average gamer (or at least i would expect for a game like Red Dead Redemption) should be able to spot a scareware popup with ease. So i cant imagine that this would gain too much in the way of sales for the scareware app itself.
If it was a trojan that stole credit card details or made this a zombie client then i could see it being a way for miscreants to make money (and who knows that might be a backdoor route of this infection which hasnt been noticed yet). But pushing Scareware to people who are at least relatively tech saavy doesnt sound like an overly profitable venture to me!