I might be missing something here, but I wouldn't call 3k every 30 mins - 6k every hour a fantastic source of gil at all. Even if you can miraculously clear AK in 10 mins thats 18k an hour, still not great. You'd be much better off crafting. I mean it's a lovely bonus and I'm not complaining because now I can guaranteed afford my repair bills after every run, but it's not really game breaking. It does seem like it's raining gil though when it drops from every mob!