The only question I ask to anyone adding anything to a recipe (beer, cocktail, food, anything) is, "how does the addition improve the end-product?"
I'll sprinkle eggs Benedict with a little paprika at breakfast to break up the monotone sauce without hesitation. However, Green dye to make green beer is not an incentive to me, nor is glittery brew. If it turns out that edible glitter works better than gelatin, irish moss or any other fining agent, I bet we would see many of us picking up a bag of bling.
One could loosly argue that it could be perceived as an improvement to visual presentation; however, this assumes that the only difference between two brews is the glitter. A glitter-bmc vs almost anything else: I'll take almost anything else.