The only people paying $300 for this game are the ones trying to "complete" their collection. These games are likely not being played, and probably barely being looked at. They are a filled-in checkbox on a list somewhere. Unfortunately, these buyers are the same kind of people who will cling on to the game until their dying days unless the value goes up enough for them to re-sell at a significant gain. In other words, the price is likely only going to rise.