Because you need to make that Bio III hit for max dmg/tick silly. That is the most important thing a RDM can gear for!. Like Ive been saying, Seriha is a whiner, she/he has bitched about inventory issues fora long as time (back at 75 cap before sack/satchel even), and always finds some other excuse to not being able to carry a melee set.

If you are in a melee position you are likely /DNC, /NIN, /WAR, /BLU. Dark Magic set is useless unless you are /SCH or /BLM. Highly situational, and at which point you likely aren't meleeing (so leave that gear in your sack and take your dark magic set).

Whiners will be whiners, keeping their hands out for crumbs from SE since 03' Right Seriha!.