What are people talking about? "promotes gold selling" ... bullshit, there are other mobs to farm for gold, devilsaurs aint the only one, maybe the most profitable but if you're not the alpha in the room and can't dominate the others then you simply have to go elsewhere.
I to think that devilsaur maffia are one of the interesting part of the server, its like in real life, one of the most profitable things will get attention and cartels running them, like the drug bussiness.
Stop crying over a area you can't control with 1 player, get your guild there and kill them if you want to claim the land. And mage cant sheep your mobs if you got fast enough attack speed like a hunters cat pet attacking mob. So get a hunter friend to help you to combat sheeping.
You really dont even have to focus to combat sheeping if you have guild mates there, 20 guildmates and the best mage cant sheep your mobs. Try sheep a mob that 20 people attacks. What the hell even 2-3 will do.