Because frankly, every time I see someone using it in the crucible they're at the bottom of the scoreboard.
Edit: Do it like the rest of us, let your gameplay do the bragging.
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I usually only wear mine to make my friends who haven't gone flawless jealous. Even though I've only gone flawless once, and was definitely the least effective member of my team. I honestly like my Moon of Osiris emblem better so I wear it if I'm feeling like showing off my Trials rewards.