I think once I have my crafters and gatherers all up to 60 I'm going to make 5* items with nothing more than a little time as my mats will be nearly free. Then I'm gonna sell all my 5* craft goods for 500 Gil a pop just to piss you market board junkies off.

News flash, Vanity gear, Air Ship Parts, Chocobo Items, and Furniture are the only real market driving items and Materia Fluctuates to much to be a stable long term investment.

Extra retainers do give you the potential to make more Gil, but honestly what will you do with it? Housing plots? Furniture? Vanity/Alt Gear? Having a shit tone of Gil doesn't give you any edge over those of use who don't have it, you just get to have a few "Shiny Things" that we don't want/Can do with out until we can afford them. The only thing that required any real Gil Investment was Novus phase of the relic quest and even that could be done on the cheep if you went tri-stat.