I started this kind of topic few days ago. Here http://forum.square-enix.com/ffxiv/t...ce-for-players

My recommendation
DM Grade 1 = 100 gil / Repair service = 200-500 gil
DM Grade 2 = 600 gil / Repair service = 1000-2000 gil
DM Grade 3 = 1500 gil / repair service = 2000-3000 gil
DM Grade 4 = 2800 gil / repair service = 3500-4000 gil
DM Grade 5 = 4500 gil / repair service = 6000-10000 gil
As I saw many people looking for fix these day, they usually put 5000 for grade 5.
But it still ok because we still got some sp as a reward for fix ( also, we don't lose anything to get that sp lol )

But some people still cheap out by putting 1000 for grade 5, and I saw them standing there without their equipment fixed lol.