About FFIX vs FFVII. Although FFIX sold more in its first week, overall FFVII sold much more copies (almost 4 million). That was because it was the first game on the PS1, it had a ton of hype and a huge advertising campaign.

FFIX on the other hand was advertised much less heavily. It was also the last on the PS1, so people were looking towards the PS2. Finally, a lot of fans were shallow and didnt want to play it due to the change of scene from modern to medieval. Also because of the character designs.