They're making their money back in other ways. Minecraft has become one of the go-to games for kids. It turned the XBox into a more kid-friendly console, a market Nintendo historically had in their back pocket. Parents aren't as intimidated buying their children XBoxes when its bundled with Minecraft as the console draw rather than Halo. They also haven't had to release significant iterations of the game to maintain freshness on new releases like Mario. Little work with a trickle reward that'll pay off more the longer its present. I suspect children today look at Minecraft the same way we looked at Mario in the 90's.