That's what happens when grief/harassment is officialy allowed
Mail blocking, portal overlap, quest bugging etc. as you noticed such actions which annoy other people are openly allowed by warmane. Even that in most games today is disallowed. Even on wow retail itself nowadays results in suspension.
So this behavior as expected is starting to expand. Now we have on icecrown even guilds dedicated for this purpose. (who plays on icecrown ally side knows which one it is). People even openly advertise guild recruitment to join them just to do this.
I think it's really shame that warmane staff allows such behavior to expand on server. I'm sure it's not only me who notice this getting more and more popularity. I understand most of this have interface workarounds like zoom in, ctrl+v, but this is about bad atmosphere which it makes, it gives idea with what kind of people you are playing on realm. Only what it does, creates more disrespect to each other.