Im a level 32 balance wizard and i just started looking into the class specific robe designs. I was very happy with my class choice until i discovered how boring and lame my class robes were. Every other class robe i saw was very detailed and worth collecting. Then i took a good look at the balance robes and what i saw was disapointing!
When i first started my wizard, i came across some of the balance robes, but i just thought they were the plain old design and not even worth keeping.
It seems to me like who ever designed the balance robes got bored and decided to just throw a red rectangle border around the basic design. I didnt even know they were special until i started looking for them!!!