The infamous leve that many folks know of is a perfect example of a gil fountain. To the close-minded individual, it may seem like a pointless activity because of a paltry 600-700 gil for it, but to the informed, it's a ridiculously huge gil fountain towards the economy. You spend ~30sec doing the leve. 600+ gil in 30 sec. You spend 10 leves doing it. 6000+ gil in around 5-10min. Ten of your peers do it at the same time: 60000 gil in 5-10min. One hundred of your fellow server players do it: 600,000 newly created gil to be circulated in the economy, for a playtime of 5-10min. And this is just one small leve. We're not including daily quests, treasure hunting, dungeons, etc. So yeah, there's one example of a significant gil fountain.