I know YoshiP has been on record there are no current plans to use beastman coins, but i really think they could be the beginning of a great idea. With Beastman strongholds coming out in 1.19, beastman coins could really play a role in us interacting with either NPC's in the strongholds and/or the settlements.

I was doing the Thanalan quests down in Halatali where you have to kill 6 each of the Amajal (sp) and I got 3 darksteel, 2 iron, and 2 bronze beast coins. While they NPC for 2k each for the darksteel, I can't see this being the final destination for these coins.

Mods please try and convince YoshiP to somehow use these beastman coins for perhaps gear or something from an beastman NPC, or at the very least in upgrading a piece of gear, or obtaining a special Beastman materia that gives you "MobX Killer" status. There are a lot of good possibilities here.