...When you memorize each and every song and SFX in the game, and then hum them around in the street.
...When your girlfriend leaves you and you say "The Unity shall have its revenge!"
...When your room is full of Sins wallpapers and your desktop, including icons and the mouse are all Sins, and when you downloaded each and every mod published, and tested it, left a comment and made a mod yourself.
...When you enter the game you don't need to look on the screen to know where are the correct buttons to start a game as the Advent Unity, playing against the TEC and the Vasari Empire, 4x4, Large Map, Large Fleets and pirates disabled.
...When you start harassing Sins Developers with "When's the sequel, when's the sequel?!?!"
...When you convinced all your friends to buy and play Sins as well, and have become master of all multiplayer games, knowing all the strategies and factions.
...When you memorize all the faction's techs, ships, and all their related things.
...When you post in a thread named "you know you play to much sins when you....." <----