"NPC repairs cost considerably more than dark matter repairs.

Also, you need to 100% repair an item if you want to sell it.

It's working fine."

I don't think you read that correctly. Guild leves give out plenty of gil and I never have a problem with the NPC repair hit, I know that it requires 100% to sell in the AH I really don't care to even bother repairing to 100% to resale I dump old gear on an NPC and be done with it. My argument is that it's flawed. Answer me this, does an item need to be 100% to De-sythisize in to Materia? Because if not why repair it anyway?