As I actually run this on a medium sized server I can tell you from experience that players giving the codes away is not really an issue. Most players, once they find the code, make other players go and find the code also. Yes, there is the small group of players who once they find a code share it. I have noticed, however, with that group of players that the code sharing generally stops when the entire group has it and then of course they make all the other users go find the code. I can see your point Neo, as it is a valid one, but I really don't see a need for it currently.