I don't understand what's not to get here. It's like when someone once complained to me that they couldn't play Mario on PS2, because they thought that'd be an easy seller. Yeah and it'd carve a gigantic fucking hole in GameCube sales, which were low to begin with. Nintendo won't put stuff on PC for the same reason, they want you to buy their consoles.
Admittedly, TPC *could* put stuff on PC but with Nintendo making up one third of the company's make-up, it's not very likely now is it?