1700 plat for an aura is, in my opinion, not worth it. The main reason is the fact that they are cosmetic. I haven't complained about arcane and heroic pets being 1700 plat because they drastically affect gameplay and they also go for reasonable prices. Auras don't affect gameplay at all and aren't as fun as an arcane or heroic pet, so I really don't see why they should be worth as much or more.
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