One of the things that I believed collapsed the Final Fantasy franchise - Music

[Soleron]

Chris Hu said:

Gilgamesh said:

...

If music mattered that much then Lost Odyssey would have sold a lot more at least over a million copies, because it has some of Nobuo Uematsu's best work. 

The music supports the game. Appropriate music makes a game more engaging, and memorable games make music meaningful.

Few buy a game on soundtrack alone, but it will make the overall impression of the game better. In LO's case it couldn't save it being niche.