Whats the point?

I really enjoy this game the only problem I have is why do I collect so much Gil when I have no reason to use them? I have to buy characters with actual money and buy the airship ticket with actual money, so whats the point in having Gil? I wish we could use it instead of it taking up screen space.

Tesseract Alias about FINAL FANTASY ALL THE BRAVEST, v1.1.2