Here is a good strategy, install Call of Duty and Battlefield on the PCs on your internet cafe, and tell the people of your town/city that they are free to play, or if you don't like that option, you can say they can play the games for 6 dollars an hour or something like that.
However, if you don't have COD and Battlefield in you area of Argentina, you could use Medal of Honor, Soldier of Fortune or Halo instead. They are really popular First Person Shooter games in Australia, excluding COD and Battlefield.
I must admit, your business tactics are very interesting business tactics. However, they won't work though, because GTA IV won't play well at all on any integrated graphics cards. You can only play GTA IV by downloading it, or by using the game disk.