If you're going to the King Ranperre's Tomb, you might as well trade in the batwings for some San d'Orian fame. You don't make anywhere near as much money, but when it comes down to it, fame is a very useful, and important thing to have.

I agree with Grover. Go into Ghelsba and take down some orcs. I did this at level 9-10 with my warrior and made a crapload of money selling off the fire crystals they dropped. When I did this, a stack of fire crystals were going for 2,500 gil. This is on Midgardsormr, so pending on your server, the economy might be a little different.