It is an interesting equation, if it costs them almost nothing to create and 10 people buy it, the profit margins are astounding!<p>Not that I know anyone who would buy a facebook gift, but it still is a smart concept. You can see it a lot in some new Korean MMO games that have come out, where they charge small fees for equipment that doesn't cost them anything to produce after the initial design phase. This model isn't new by any means, but it always surprised me when it worked.