Agreed vanities do not directly affect game-play.
The average player who farms with gold-loot, cannot match the 999m of the hoardercumpricemanipulator.
The huge gold that hoarders manage to acquire from FAKING a price as stated in the OP, is often used to hoard the newest equipment and pets and awakening gems, etc as is obvious in merchant posts/guide-threads. Or sold for real dollars. This is what affects the health of the game, and changes game-play.
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