May I point out that any other game has this too, if you don't like it you won't be able to play any game.
Also, all games with advertisements, including entropia, gather user browsing information and locations to match the ingame advertisements to your interests. It's nothing new really, it's commonly used in the latest games and pretty much all new games are released with it.
Like
MA said, if you don't like it you can block it, but I'm sure it's harmless. Also do you really think that they have the time and put in effort to go matching IP's with a sister profile site? I don't think so, they have better things to do.
Besides more than half of the people on the net have a dynamic IP address so it's not traceable by IP anyways.