We should consider R&D for a purely console maker will mostly occur in the 2-3 years before a console is released (They will be researching and such for Wii/DS successor now, but they won't need to spend money on it until they are "in the thick of it".
Microsoft first of all released the X360 a year before Wii, so they would naturally be further along anyway... but also they will have big R&D costs constantly because of it being the EDD including other areas of entertainment.








