If people actually own a lot of devices and mine all of them on XMG i really would not mind it that much as long as he owns them and pays the electricity for it. But if it was a botnet or a rental thats a different story. But then again it is Magi rules so if pools actually enforce them i would support them since if they dont enforce the rules then what use are the rules in the 1st place. But some pools just dont follow this. Some probably have more than 30 users with high hash. And people can generally make their own pools which makes it more complicated issue.