Are you a shard farmer? From the bottom of my heart, thank you. Farming shards has the be, hands down, the worst thing to do in this game, outside of YoKai FATEs. That being said, please keep in mind general concepts of tiered pricing when selling shards. Selling shards in lower stacks, i.e. x50-x200, at a higher price can bring you triple the profits than low tier, high stack quantities.

Example below. You'll notice that there are stacks of absolutely absurd quantities of shards on my Market Board. People don't buy that. You'll notice that even at a low tier pricing, people are spending more for lower stacks. Follow this concept - this game will love you. Shards are not a finite, expedition-driven item set, so people aren't going to be desperate enough to spend 500mm in gil for their low-level crafts.

Example (Part A) - High stacks that are ridiculous:


Example (Part B) - What people are actually buying: