How i make gil at the moment:
1) Fisher - lvl 70
i) Aetherial reduction - everdeep aethersand, water/ice clusters.
ii) levequest fish - example, Koromo Octopus sells for ~9k nq, 45+ hq on Ragnarok
iii) Gazelleskin maps
2) Miner - lvl 60
i) So far just lumythrite ore from unspoiled node in Zenith (needs book) - 25 minutes cd. 9k+ nq, 14k hq ~15 items per window
3) Cracked clusters from hunts, lvling roulette which i sell straight to the market + anything i can sell from wondrous tails (minions, etc.)
4) Verity items (forbidden wax,domacoat etc.)
5) Squadrons -> all members have doh/dol materia chemistries which i also sell.
