I would like to request that SE ease up on many restrictions put in place to battle RMT. I think it's safe to say that battle is over in this game, but even if it is not: The million gil limit needs to go. The coral fragment fishing nerf REALLY needs to go(I talk out of my ass here I assume it's in effect after much research and supply being next to none on Q). Several other such nerfs need to be eased up or let go.
As for controlling the market, Bill Gates gonna Gates, okay. If you want to avoid encountering Bill Gates then you don't weasel your way onto a market scene Bill Gates brought back from the dead and start undercutting Bill Gates expecting no response, lol. Sharing sales is fine with Bill Gates. Bill Gates does not mind that. But Bill Gates gonna Gates when you start getting greedy and cause a price war. Pro-tip: don't focus on a single item. It only causes price wars and eventually market crashes, and I guarantee you Bill Gates will be the one who brings it back from the dead shortly after you move on to another item.