Yeah. Especially because once you get the airship, there's, like, no monsters at all who give big cash. And as far as treasure chests with upwards of 10000 gold per dungeon... Bfff. None.

Seriously, killing Lich in one round... Easy. You could have used Fire3 instead of fast and got the same results. Except that the Thief wouldn't have had to attack after

Lich Ice2 150 dmg each
Harm 175
Fire 175
Fighter 106

And it's done. I've never spent over 2 battles on Lich. 1 is about right, especially after lv 13.

And I guarantee you that killing everything that moves between now and Kary won't net you more than 15000, if that, and then you can make that much money by selling the Flame Armor or Ice Armor, whichever you prefer, because the Ninja can only wear one or the other, and if you're at lv. 15, your Fighter BETTER have the Steel Armor by now, or else you're just wasting money.