Not a dime. Eith the drop rates as low as they are, buying more won't imprive it.
Since AoT dropped I've gotten maybe 6 pieces of armour, mostly gloves, 1 helmet, chestpiece and thats it.
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I haven't gotten a single piece of armor. Mostly just those dumb head visual things like the snowman. ...then again, I'm only getting 2 treasures a week.