I'm honestly surprised if they haven't come back yet there because I've been seeing aethersand bots for the past week or so on Cactuar.
I personally have no issues with crystal/cluster supplies due to gathering aethersands myself whenever my GP caps, but they really kind of twist the economy into something it shouldn't be by tanking the prices on mainstream materials/crafts to extreme lows. Things tend to start off normally while there's tons of DoL/H players supplying the market, but once interest wanes and people start quitting then they gradually take over.
