I think this will be especially true in GU decks, but anywhere really
Prerelease Packs The best way to build a Sealed deck right out of the boxthe Wilds of Eldraine Prerelease Pack contains 6 Wilds of Eldraine Draft Boosters, 1 Traditional Foil year-stamped Rare or Mythic Rare card from the main set, 1 spindown life counter and more
Because of that, you can usually earn closer to full retail value, especially on expensive singles or sealed products
Based on the latest market prices tracked on TCG Stacked, Darkrai-EX is worth about $35.35 USD
However, that sets kind of a hidden banger, full of awesome cards, full-art basic lands, and the Memory Corridor cards depicting characters from the franchise