Well, i can just say that this is Blizzard sending as message, just like with other youtube personality bans: When you are content creater, the rules apply to you double. If you mess up, you mess up on the stage and therefore you should watch out even more. DON'T BREAK THE RULES!
Can only say, that Preach kinda deserved it, even if i find his views on raiding, and just in general, quite valid. But if you live off WoW, you really have to watch out to not break the guide lines.