Going free-to-play is, rather unfairly, considered a sign that an MMO is dying. World of Warcraft is pretty much the only MMO that has managed to maintain its monthly subscription fee for the entirety of its existence without any permanent price drops. While that hasn’t changed, the MMO has adopted a new system that takes it about as close to going free-to-play as it has ever gone. This system essentially allows users to purchase subscriptions using in-game currency.