Scrap the marketplace system please
The single biggest quality of life improvement you can make to this game is fixing the marketplace system. It's just terrible. I spend more time adjusting prices (because the second you list something, you're immediately undercut) than I do enjoying the game.
It's a tedious, irritating process that is easily remedied by returning to the excellent system Final Fantasy XI used. I don't know why this hasn't been addressed sooner, I can't be the only person who finds it infuriating?
(Edit. I now realise this is about the 100th thread on the same subject, so apologies for that, but the point is still valid).