Okay, I'm not one to follow the crowd, but I think you need to rethink your announcing the winners to EVERYBODY! All that does is invite SPAM from other players wanting your new found ship. I win the Galor and the next thing I know my mailbox is full.
What we need is a real Master Key that you by for 900 credits, Lifers would get one Free and then it stays with you for the life of your toon and can open any and all green boxes with out buying another key! The single keys would be for opening the pink boxes but I've had several of those that had a tribble in them.... So major bummer on that!