Replace the Heat Amplifiers in the Supply Depot with what could be called a Fire Crystal Multiplier (or Duplicator?).
Allow each multiplier to double the amount of shards the individual user finds, last for the same duration as their respective amplifiers, and cost the same price. So long as the shard drop rate remains the same, I can see this being of greater use to people trying to heat their five star gear. Furthermore, I see no actual use to the amplifiers now a days.
I feel like I am missing something. Your thoughts?
-edit from Shard Multiplier. Thanks for the notice.
You mean Fire Crystals?
The only shards I know of (that aren't an event material or a shoddy bomb) are these, and I'm pretty sure no-one needs any more of those.