80ks are those that at gold level cost 20k, those that at gold level cost 32k at red level cost 128k

@OP: donate the max to your group every day, so you can get a ton of coupons from the group wheel (i get an average of 30-40 coupons per day out of 14 rolls per day), and use the rest in eight inner gates to pull more red runes and gather points for when they'll implement red runes and gold initiative rune in the exchange shop.