Because this thread suggests you should? Whereas you still shouldn't? And as I've said it only applies if you already own a PS3 or a 360.
That still doesn't answer why exactly the PS360 versions are the better investment from a technical standpoint. You say "don't buy the Wii U version when you have a PS360", but why?
Ongoing bet with think-man: He wins if MH4 releases in any shape or form on PSV in 2013, I win if it doesn't.