I'm guilty of this and I admit it. I have all crafts at 50 yet I only craft the weapons needed for the relic quest. I do this because I make on average an 8k profit on each since I farm all mats except for the crystals, and they sell quick. When I make lower lvl items most of them require 3-4X the amount of mats and you make a few hundred gil profit, and they stay on the board for days.

Yes I know it's selfish but like you guys I want to play the game as well and not sit there crafting all day. I think if SE gave some incentives to crafters more people would level up these jobs and you would see more of the lower lvl stuff on the boards.