I really enjoyed this thread! For me the reason why mobs shouldn't drop gil is very simple. The only reason I have been able to get my luminary tools is because I have been able to buy things like hides that other people, who like to kill thing, have farmed. Farming them myself would have taken too much time. The reason these useful items are being farmed is that they sell for good gil. If mobs dropped gil as well then the people out killing would stop killing things that crafters need and kill whatever drops the most gil and the economy would be seriously broken.