Pay your dues--I'll set you free
From boundaries of monotony;
And danger I will help you to surmount.

Raise or lower the standard fee,
Rewards will change accordingly;
But careful not to bankrupt your account!
Um..well, I've thought of alot of vague things, neither of which I think would be the right answer.

First thought: Sephy's HP count? "Pay him back" for what he's done, he is the final boss and main antagonist.It can be altered, but if you use KOR and have maxed-out characters, it can be too much. You can lower his HP total a little by killing the head. Meh. You'd 'pay' for making him too tough, I suppose, and you can 'lower' it in the sense that you can lower it a little. Hmm...

Second: I would say paying for the soldiers at Fort Condor, but you've already said it has nothing to do with Gil, so...

Third: Digging at Bone Village? I guess that costs Gil..

Meh.