The difficulty may stem from how the venture causes "lack of focus" in developers as they work to port a game. While they are porting, thoughts on how unlikely it may be for them to recoup porting costs overtake their thoughts and that leads to mistakes, lack of concentration and the occasional sleep deprivation.
Nintendo is selling their IPs to Microsoft and this is true because:
http://gamrconnect.vgchartz.com/thread.php?id=221391&page=1







