-Ability to create high-level gear (80-90-100-etc) with materia slots. This will give more incentive to end-game cratfers besides just attach materia and will help the in-game economy (remember we can trade items for money now with the new loot system I mentioned above ).

Imagine this scenario: I keep running dungeons over and over without getting the gear I actually want. If I keep trading the drops I don't need for gil, eventually I may just be able to buy that nice i-lvl 90 chest piece I wanted from the market place (besides also having the option to trade allegan tombstones for other gear). This creates an incentive for crafters to keep crafting new high level gear and also farming the high level mats needed (see primal fights above) to create that gear (or buying the high level mats from the market place, driving the economy and helping gatherers).