Its as Terrini said player greed is the cause,I'll use myself as an example.
I am Stuck on T9 (Had issues before the nerf and even so now 10% echo aint cutting it)I work full time and I am a Full-time College student so I dont always have the time to offer for a Static. I try to make a Progression PF but those can be Hit or miss.
DF is out of the question since everyone likes to ignore mechanics. Shady people try to offer me a carry, which I always decline but they try to charge 5mil Gill or more. Which brings me to my next point.Players who have 5million gil most likely have nothing to do with T9 or carries in general and are doing other things, The"casual" players that they try to market to cant afford such inflated prices and this is where the RMT comes in and try to sell Gil to those players.The Greed of players is what is poisoning the community.