If a Jew lends a player in a multiplayer online game money, and he knows without a doubt that that player is Jewish, does the prohibition of ribis apply? (After all, the only thing that changed was a couple of 1s and 0s on a server somewhere...)
For example, would it be permissable to charge a pre-arranged fee if the loan is not paid back on time, or even a percentage, in the setting of an online game?
It seems from this that the halacha is not related to virtual goods until they become real money. If that's true, would it also apply to virtual money? If not, would the fact that selling the virtual currency for real money is a violation of the game's terms and conditions change anything?