Price has never been an issue for me. That said, it's highly unlikely that I would buy it at launch.
Just like the PS3, I would just wait for an MGS game to come out first before buying (or GT but odds are that MGS would come out first). I would be really pleasantly surprised if Konami managed to out an MGS game at launch (Ground Zeroes most probably since MGS5 doesn't seem ready for prime time yet) especially seeing that this is the year of the snake (巳年) :)
No foreign sky protected me,
No stranger's wing shielded my face.
I stand as witness to the common lot,
survivor of that time, that place.
- From 'Requiem' by Anna Akhmatova







