There is a gil generating methods named by those who know it - and I'm not even kidding here - Fight Club. Those who know of this method don't want it to become too widespread, and for good reason, because it might get nerfed.
I'm posting it here because I think it's incentivizing people to hoard a large amount of housing. There are people on certain discords bragging about their multi gil cap wealth and the 2-3 digit number of plots they own, almost on a daily basis. Now if SE could at least take away the passive gil making capabilities of housing, it might allevate the housing problem, and fight inflation with one stroke.
EDIT: Wow the flight club members sure are quick to denounce this. They are saying this might not be that worthwhile to the average player having access to one fc house, and they are right to a certain degree. The point of this post is that it's a very lucrative method when scaled, by hoarding a lot of houses; this gil making method directly incentivize and support those that sit on a large amount of housing. But don't just take my word for it, here are some endorsements from some flight club members: https://imgur.com/a/u213pGX
EDIT2: Why this getting nerfed is a good thing for everyone save for a select few - https://forum.square-enix.com/ffxiv/...=1#post5706104
How to 'easily' make gil with submersibles
I put 'easily' in quotes because the barrier of entry to this method is fc housing. But the pay off is 300~500k gil per day (RNG dependant), and the maintenance would just be sending 4 subs out every 2 days; very minimal.
The Setup
The setup may looking daunting but you only have to do it once for each fc and it all pays off in the end. I won't go in too much detail, but the gist is:
- This is the most difficult part - come in posession of a fc housing. Doesn't matter the size, and build a workshop.
- Ignore airships and rank up your submersibles to 90. You can look up guides on how to do that most efficiently.
- For each sub, you want a final build of: Modified Shark Hull, Coelacanth Stern, Modified Shark Bow, Modified Shark Bridge (this is just one of the viable builds)
Raking in Gil Every 2 Days
- Send your submersibles out to Deep-Sea Site: Unidentified derelict -> The Wreckage of Discovery I -> Concealed bay -> The Wreckage of the Headway
- With the above build, the trip would take 1d22h at max rank
- The four sectors above all includes salvaged jewelry (vendors for 8000-13000 each) and the Extravagant versions (vendors for 27000-34500 each) in their loot table
- When sub comes back you vendor the loot and get gil. No need to repeatly craft/turn in a quest or deal with the marketboard, just vendor the stuff!
- Loot is RNG dependant, but on average this generates 100k gil per sub per day, which amounts to 400k gil per day, per fc workshop, for very minimal work aside from the setup.