hanafuda on 27 October 2009
'Because MH is one of Capcom's biggest franchises but isn't popular in the West so that gives them a good incentive to make MH3 Wii exclusive because they lack the marketing abilities to do it themselves.'.
You said it, it isn't popular in the west.
You haven't answered WHY Nintendo would promote a third party game though. Do Nintendo promote Konami Wii games in the west?
PSN - hanafuda
