heh 2 million that's a bad number...
Where Atlus barely make 3-4k of their biggest RPGs, Nintendo gets 2M with Wii Music and calls this "below expectations". Was Wii Music profitable? HELL YES so I think it's better to be thankful for it's sales than its "lost potential"
PS: The first kind of dance mat came way before konami and guess what, it was a NES peripheral made by...Bandai.