I think they'll have a tough time with ARR. Gil isn't particularly hard to earn yourself. Also what is there to spend gil on really other than day to day expenses such as travel? The best DoW/DoM gear seems to come from drops, the only expensive crafted gear seems to be for crafters and gatherers who don't need to buy gil. The only area I see gil sellers profiting is with the housing system and gil transfers of that amount will show up quite easily I should think.
