Original Post
I just thought of something like this (for a multiplayer game): Player's make an account (username and password), but also set a guest password. Player's can tell their friends the username and guest password which will allow friends to play the game with the account holder, as long as the account holder is online at the same time (up to a certain max of guest players - say 4). Do you think such a system is giving potential buyers an easy free-ride? (especially if they share the true password to the account), or could it help sales through word of mouth? What incentives could you give the account holder not to share the password? (assumming he knows & trusts his friends so he doesn't lose his account). Stats / progress tracking comes to mind.