how is that a bug? I would have to know that it is a bug to exploit it. Just because something gives me exp over and over does not mean its a bug. How does one know they are exploiting when they don't even know it's a bug.

When I saw this post I never thought it was a bug. I thought it was intended to be that way and someone smart said "hey we can lvl off that".

Most "bugs" come from blizzard putting something in place and finding out someone found a nice way to lvl which is not how blizzard intended. Instantly they are exploiting and in blizzards eyes should get the ban stick.