Here's the problematic script:
Little Johnny finds a server that is selling diamond tools for $100 a pop. He says something about how he doesn't know hoe to buy things online, and a nice server admin walks him through "borrowing" his parents credit card and making the purchase. His parents get the bill, hit the ceiling, google "Minecraft", get a number for Mojang, call up, and start screaming at people to refund the money.
It happens. Having a decentralized server system with unregulated "in app purchases" and a very young fan base in a recipe for bad publicity, angry parents, upset kids, and bad vibes all the way around.