Marvelous was quite frank in their financial reports saying that 3/4 of their Wii games lost money (Little King Story was the exception) and that 4/5 PSP games made them money.
It seems that Harvest Moon wasn't included in the count that Marvelous gave as they did not make the game.
A few sales blurbs.
Arc Rise Fantasia JP = 45,000
Valhalla Knights: Eldar Saga NA = 16,000
Harvest Moon: Tree of Tranquility EU = 57,000
Little King's Story:
JP = 26,000
EU = 67,000
NA = 37,000
Total = 130,000
Everything was taken from here. Here's a link to the actual Japanese financial statement.
Edit: Look at that PSP go! It's such a software beast! 
More figures courtesy of jarrod.
Valhalla Knights 2 (EU) 3k
Hitman Reborn! Battle Arena 2 (JP) 41k
Half Minute Hero (JP) 70k








