What's the MMO with the most valuable/in-demand currency at the moment?

A while ago OSRS would have been the obvious answer, but i wonder if that's still the case since the removal of the duel arena.
What do you think is the most bought MMO currency (not services) at the moment? FFXIV Gil? WoW Gold? These are popular games, but popularity doesn't always translate to demand (but the prices for those currencies on Player Auction look good).
I ask because i'd like to know which MMO currently is worth working towards if my goal is to consistently sell currency (so not accounts) for more than a single cent per million.

 

pretty sure its still osrs

 

probably stick to OSRS unless you're familiar with how to effectively farm on other games and the RWT system

OSRS still might be at the top, even though gold is at 0.3 right now u can still get up to 14m/hr doing some methods and even more if ur lucky on drops.

 

What's 14m/hr? Phos Nightmare?

 

nex