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I know battlecraft gets bonus XP if you have a high level class and you level a low level.
Does the same bonus apply to harvesting and crafting if I have a high level crafter/harvester?
In this game, gear can be "converted" into materia when you reach 100% spiritbonding. Some items can't be converted and it will say "Non-convertable" on the bottom.
I wouldn't go nuts with saving low level gear because they yield Rank 1 materia which you can buy at the marketplace for 100-500 gil each.