I can think of a few things:

Making lowbie gear for leveling your alt jobs
Making gear for fresh 50s to get out of their AF (militia gear is on par with WP gear unmelded, usually better than AK gear when melded)
Making gear to supplement your jobs between DL and i90 (two-star gear is generally superior to DL even with just standard grade III melds)
Creating specific melded gear for min/max purposes (also reaching specific stat caps when transitioning between sets)
Crafting for housing
Crafting consumables (mentioned)
Having fun trying to HQ and killing time

I'm sure someone will shoot all this down but that's why I craft. I make useful stuff all the time for myself and the FC, and it blows my mind that people think crafting is useless.