Originally Posted by
Psion
I think of gil as a sort of magical energy that you could gather from monsters, that would be used as a currency because it could then be used for many things, such as used to craft objects, make plants grow faster, etc. That would be why all monsters seemed to drop gil when you killed them.
except in this game, said energy already comes in the form of crystal shards and clusters and the like, so gil winds up being an actual currency here instead. That's why only humanoids drop it, and maybe some NMs that happened to snack on said humanoids and maybe there's some stuck in their belly. (at least, FFXI had NMs that dropped gil.)