You'll need to ask Kasz216 about the specifics as there are are only hazy details available on this issue and some older articles are no longer available, but I think the $100 million may have been the spend of a larger PS campaign in which FFVII was simply the main game pushed during the marketing campaign.
In return for advertising they got exclusive publishing rights on a few titles I believe.
Also that number is meant to be US only.








