Gil Farmers:
Anyone that's there for the sole purpose of making gil to sell to a third party for RL money.
HNMLS and other high levels do not fall into this category, cuz they structure elaborate Alliances, plan ahead, coordinate, and orchestrate hunts, besides, they hunt HNMs and use the drop items to craft or sell to get better in-game stuff anyways - they don't sell their gil.
Gil Farmer Example:
Saitayang, Waitmagic, Generate, Letter, Dragonwolfer,
Tanffxi b,c,e,d,f, Windboy, Gtroc and the Full AF PT (Kuftal and Bohyada Tree)... They usually have thier haunts and hang out there 24/7/365 >< I'm sure there's more, but I only know these guys currently.