Well since so many people complain that they cant make gil I will give them some options.

How to make gil as DOW or DOM:

Step 1: Buy cheap lvl 48-50 gear that wont affect your combat effectiveness too much. For example a full set of 48-50 jewelry works well.
Step 2: Do 2 easy dungeon runs like CM
Step 3: Convert all cheap items to materia

Outcome: 200 tombstones + 5 lvl 3 materia. With tomstones buy materials for 125 each that are worth 30-35k on my server. Total gain for 2 runs is about 70-150k depending on materia you get. Takes less than 2 hours total.