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 use my Trials emblem when I'm playing Trials. Not necessarily to brag, but its an event. I wear all the Trials gear and equip the Trials ship and the emblem, hopefully I can get the shader soon. Just because its Trials. I do the same with Iron Banner.