With the release of the +2 armor sets and the extreme rarity of the mats to make this item which is needed to upgrade the Beastmaster Relic set to +1, This item is going to be exspensive for quite a while.
As the price is currently on Siren, it is not worth buying this item to upgrade Monster Gloves to +1. You will spend less on 20 Forgotten Touches @ 20k each (400k), than the 500k you will spend on this, plus the 27 T.Whiteshells (162k @6k each) needed for the upgrade.