When all the rest of the "Emperor's New" stuff, including the PGL fists, are like 2k gil each and from an entirely different source?
Would it really have killed you to simply add the shield that's clearly part of the same set of "invisible" gear to the same vendor that has all the rest of the "invisible" gear? This thing sticks out like a sore thumb now (which, ironically, is exactly the opposite of what it's supposed to be doing)
The only reason I can think of it being like this is because the other "invisible" shield happened to be from Garo stuff and THAT one cost 100k MGP if you didn't want to earn/spend the PvP points on it, and they didn't want to step on the toes of anyone who got that, but come on, that reasoning is pretty lame.