Marketboard PSA

[Seraphor]

With adventurer in need:
Expert Roulette - 14k
Level 80 - 14k
Level 50-70 - 14k
Leveling - 20k
Trials - 16k
MSQ - 14k
Mentor -11k
Alliance raid- 19k
Normal raid - 13k

Total: ~135k
Source: https://ffxiv.consolegameswiki.com/wiki/Duty_Roulette

Not including the gil rewards for completing weekly challenges, selling off the tomestone mats,materia etc

If you combine roulette with treasure maps,hunts even more gil

Crystarium crafting leves will give you a minimum of ~1-2m for 100 leves/HQ hand ins.

That's practically a day job. I get maybe Levelling and Alliance roulettes done most days, and the odd trial roulette.
All of that before you do any actually enjoyable content. That's definitely, as Jin put it, no life mode.