Quote Originally Posted by Kes13a View Post
on the surface, appears to be a nice idea... but..

if you put up 50, sell only what someone needs, and are undercut, the remaining ones wont sell, until you lower the price. it could be up there for a while as you are being undercut by others as time goes on and theirs gets purchased over yours. That will play havoc with the open market spots on retainers. Or are you also suggesting they set the pricing as well?
Guild Wars 2 has this method in their Trading Post.

Things are eventually sold unless you've put your price at way too high for current demand.

Granted, an individual doesn't have a limited number of slots to sell things in FFXIV like they do in GW2.

I'd say for this to be plausible, they'd have to make retainers be able to sell an unlimited number of items to account for things that may take ages to sell. I've had things in GW2 take months to sell, some of them were up for more than a year even - and they were at minimum price you could sell them on the market for. And that's not reasonable for a game that limits how many things you can sell at any one time.