Just a heads up as I'm sure some of you have come across them. I've already reported some.
Coerthas for example. 3 mages using an afk auto target bot 24/7 killing sheep for skins and fleece. Thankfully they are slow and you can easily outclaim them. They will try to pull the trade block crap, blisting seems to block it.
Market is over saturated with fleece due to them and a stack of 99 goes for 100k. Easy way for the gil sales.